Bump actions/checkout from 3 to 4 (#90)

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v3...v4)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/workflow.yaml

@@ -5,7 +5,7 @@
       "runs-on": "${{ matrix.platform }}-${{ matrix.version }}",
       "steps": [
         {
-          "uses": "actions/checkout@v3"
+          "uses": "actions/checkout@v4"
         },
         {
           "run": "mkdir artifact"
@@ -116,7 +116,7 @@
       "runs-on": "ubuntu-22.04",
       "steps": [
         {
-          "uses": "actions/checkout@v3"
+          "uses": "actions/checkout@v4"
         },
         {
           "run": "cabal check"
@@ -128,7 +128,7 @@
       "runs-on": "ubuntu-22.04",
       "steps": [
         {
-          "uses": "actions/checkout@v3"
+          "uses": "actions/checkout@v4"
         },
         {
           "uses": "haskell/actions/hlint-setup@v2",
@@ -143,7 +143,7 @@
       "runs-on": "ubuntu-22.04",
       "steps": [
         {
-          "uses": "actions/checkout@v3"
+          "uses": "actions/checkout@v4"
         },
         {
           "uses": "haskell-actions/run-ormolu@v14"