fix(ci): upgrade Gradle Build Action to v2.4.2 to prevent secret leakage

- Updated Gradle Build Action to v2.4.2 in GitHub workflows to fix potential secret leakage issue.

Author: Patrick Mirwald

.github/workflows/pre-merge.yaml

@@ -18,6 +18,6 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v3
       - name: Cache
-        uses: gradle/gradle-build-action@v2
+        uses: gradle/gradle-build-action@v2.4.2
       - name: Validate
         run: ./gradlew check validatePlugins --continue

.github/workflows/publish-plugin.yaml

@@ -15,7 +15,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v3
       - name: Cache
-        uses: gradle/gradle-build-action@v2
+        uses: gradle/gradle-build-action@v2.4.2
       - name: Validate
         run: ./gradlew check validatePlugins --continue
       - name: Publish