chore: bump up postcss-loader version to v8 (#5609)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [postcss-loader](https://togithub.com/webpack-contrib/postcss-loader) | [`^7.3.3` -> `^8.0.0`](https://renovatebot.com/diffs/npm/postcss-loader/7.3.3/8.0.0) | [![age](https://developer.mend.io/api/mc/badges/age/npm/postcss-loader/8.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/postcss-loader/8.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/postcss-loader/7.3.3/8.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/postcss-loader/7.3.3/8.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

<details>
<summary>webpack-contrib/postcss-loader (postcss-loader)</summary>

### [`v8.0.0`](https://togithub.com/webpack-contrib/postcss-loader/blob/HEAD/CHANGELOG.md#800-2024-01-16)

[Compare Source](https://togithub.com/webpack-contrib/postcss-loader/compare/v7.3.4...v8.0.0)

##### ⚠ BREAKING CHANGES

-   minimum supported Node.js version is `18.12.0` ([#&#8203;677](https://togithub.com/webpack-contrib/postcss-loader/issues/677)) ([8dd0315](8dd0315c03))

##### [7.3.4](https://togithub.com/webpack-contrib/postcss-loader/compare/v7.3.3...v7.3.4) (2023-12-27)

##### Bug Fixes

-   do not crash if pkg.(d|devD)ependencies unset ([#&#8203;667](https://togithub.com/webpack-contrib/postcss-loader/issues/667)) ([8ef0c7e](8ef0c7e5c6))

##### [7.3.3](https://togithub.com/webpack-contrib/postcss-loader/compare/v7.3.2...v7.3.3) (2023-06-10)

##### Bug Fixes

-   **perf:** avoid using `klona` for postcss options ([#&#8203;658](https://togithub.com/webpack-contrib/postcss-loader/issues/658)) ([e754c3f](e754c3f845))
-   bug with loading configurations after updating `cosmiconfig` to version 8.2 ([684d265](684d265439))

##### [7.3.2](https://togithub.com/webpack-contrib/postcss-loader/compare/v7.3.1...v7.3.2) (2023-05-28)

##### Bug Fixes

-   use `cause` to keep original errors and warnings ([#&#8203;655](https://togithub.com/webpack-contrib/postcss-loader/issues/655)) ([e8873f4](e8873f46b4))

##### [7.3.1](https://togithub.com/webpack-contrib/postcss-loader/compare/v7.3.0...v7.3.1) (2023-05-26)

##### Bug Fixes

-   warning and error serialization ([65748ec](65748ece39))

### [`v7.3.4`](https://togithub.com/webpack-contrib/postcss-loader/blob/HEAD/CHANGELOG.md#734-2023-12-27)

[Compare Source](https://togithub.com/webpack-contrib/postcss-loader/compare/v7.3.3...v7.3.4)

</details>

---

### Configuration

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♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

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---

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packages/frontend/core/package.json

@@ -77,7 +77,7 @@
     "nanoid": "^5.0.3",
     "next-auth": "^4.24.5",
     "next-themes": "^0.2.1",
-    "postcss-loader": "^7.3.3",
+    "postcss-loader": "^8.0.0",
     "react": "18.2.0",
     "react-dom": "18.2.0",
     "react-error-boundary": "^4.0.11",

yarn.lock

@@ -377,7 +377,7 @@ __metadata:
     nanoid: "npm:^5.0.3"
     next-auth: "npm:^4.24.5"
     next-themes: "npm:^0.2.1"
-    postcss-loader: "npm:^7.3.3"
+    postcss-loader: "npm:^8.0.0"
     raw-loader: "npm:^4.0.2"
     react: "npm:18.2.0"
     react-dom: "npm:18.2.0"
@@ -17749,7 +17749,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"cosmiconfig@npm:8.3.6, cosmiconfig@npm:^8.1.0, cosmiconfig@npm:^8.1.3, cosmiconfig@npm:^8.2.0, cosmiconfig@npm:^8.3.6":
+"cosmiconfig@npm:8.3.6, cosmiconfig@npm:^8.1.0, cosmiconfig@npm:^8.1.3, cosmiconfig@npm:^8.3.6":
   version: 8.3.6
   resolution: "cosmiconfig@npm:8.3.6"
   dependencies:
@@ -17792,6 +17792,23 @@ __metadata:
   languageName: node
   linkType: hard
 
+"cosmiconfig@npm:^9.0.0":
+  version: 9.0.0
+  resolution: "cosmiconfig@npm:9.0.0"
+  dependencies:
+    env-paths: "npm:^2.2.1"
+    import-fresh: "npm:^3.3.0"
+    js-yaml: "npm:^4.1.0"
+    parse-json: "npm:^5.2.0"
+  peerDependencies:
+    typescript: ">=4.9.5"
+  peerDependenciesMeta:
+    typescript:
+      optional: true
+  checksum: 8bdf1dfbb6fdb3755195b6886dc0649a3c742ec75afa4cb8da7b070936aed22a4f4e5b7359faafe03180358f311dbc300d248fd6586c458203d376a40cc77826
+  languageName: node
+  linkType: hard
+
 "create-jest@npm:^29.7.0":
   version: 29.7.0
   resolution: "create-jest@npm:29.7.0"
@@ -19268,7 +19285,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"env-paths@npm:^2.2.0":
+"env-paths@npm:^2.2.0, env-paths@npm:^2.2.1":
   version: 2.2.1
   resolution: "env-paths@npm:2.2.1"
   checksum: 65b5df55a8bab92229ab2b40dad3b387fad24613263d103a97f91c9fe43ceb21965cd3392b1ccb5d77088021e525c4e0481adb309625d0cb94ade1d1fb8dc17e
@@ -24201,7 +24218,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"jiti@npm:^1.17.1, jiti@npm:^1.18.2, jiti@npm:^1.19.1":
+"jiti@npm:^1.17.1, jiti@npm:^1.18.2, jiti@npm:^1.19.1, jiti@npm:^1.20.0":
   version: 1.21.0
   resolution: "jiti@npm:1.21.0"
   bin:
@@ -28966,17 +28983,17 @@ __metadata:
   languageName: node
   linkType: hard
 
-"postcss-loader@npm:^7.3.3":
-  version: 7.3.3
-  resolution: "postcss-loader@npm:7.3.3"
+"postcss-loader@npm:^8.0.0":
+  version: 8.0.0
+  resolution: "postcss-loader@npm:8.0.0"
   dependencies:
-    cosmiconfig: "npm:^8.2.0"
-    jiti: "npm:^1.18.2"
-    semver: "npm:^7.3.8"
+    cosmiconfig: "npm:^9.0.0"
+    jiti: "npm:^1.20.0"
+    semver: "npm:^7.5.4"
   peerDependencies:
     postcss: ^7.0.0 || ^8.0.1
     webpack: ^5.0.0
-  checksum: 743a4286db68169d271bef31e6e9351874bcf2dfa408b82c648c2d5bfba9c862cbfe3004494d927469654d6ac8b82fe647f2b80a186c1dbd44d81632eec1e838
+  checksum: efbb59d2b72884c9f8c2310f1401efc6c4b01f8ffb571e2c9b151243947053eab9096c143b9bf09ada7c310c914eac759d5cf30a7cf84875a0e7cba0bc6d6c75
   languageName: node
   linkType: hard