Update Gradle Wrapper Validation to v4

As documented here:
https://github.com/gradle/actions/blob/main/docs/deprecation-upgrade-guide.md#the-action-gradlewrapper-validation-action-has-been-replaced-by-gradleactionswrapper-validation

.github/workflows/gradle-wrapper-validation.yml

@@ -7,4 +7,4 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: gradle/wrapper-validation-action@v3
+      - uses: gradle/actions/wrapper-validation@v4