upgrade gradle action

Author: pahjbo

.github/workflows/gradletest.yml

@@ -24,7 +24,7 @@ jobs:
     # Configure Gradle for optimal use in GitHub Actions, including caching of downloaded dependencies.
     # See: https://github.com/gradle/actions/blob/main/setup-gradle/README.md
     - name: Setup Gradle
-      uses: gradle/actions/setup-gradle@v3
+      uses: gradle/actions/setup-gradle@v4
 
     - name: Test with Gradle Wrapper
       run: ./gradlew test

.github/workflows/site.yml

@@ -29,7 +29,7 @@ jobs:
       # Configure Gradle for optimal use in GitHub Actions, including caching of downloaded dependencies.
       # See: https://github.com/gradle/actions/blob/main/setup-gradle/README.md
       - name: Setup Gradle
-        uses: gradle/actions/setup-gradle@v3
+        uses: gradle/actions/setup-gradle@v4
 
       - name: Test with Gradle Wrapper
         run: ./gradlew doSite