fix(bindings/node): Make peer dependency of helpers optional (#7216)

**Description:**

Mark the `@swc/helpers` dependency of `@swc/core` as optional.

**Related issue:**

 - Closes https://github.com/swc-project/swc/issues/7212.

package.json

@@ -136,6 +136,11 @@
     "peerDependencies": {
         "@swc/helpers": "^0.5.0"
     },
+    "peerDependenciesMeta": {
+        "@swc/helpers": {
+            "optional": true
+        }
+    },
     "funding": {
         "type": "opencollective",
         "url": "https://opencollective.com/swc"

yarn.lock

@@ -2526,6 +2526,9 @@ __metadata:
       optional: true
     "@swc/core-win32-x64-msvc":
       optional: true
+  peerDependenciesMeta:
+    "@swc/helpers":
+      optional: true
   languageName: unknown
   linkType: soft