Upgrade Gradle wrapper validation to new action v5

The `gradle/wrapper-validation-action@v3` has been superseded by `gradle/actions/wrapper-validation`

https://github.com/gradle/actions/tree/main/wrapper-validation

Signed-off-by: Roger Sheen <[email protected]>

Author: infotexture

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

@@ -1,4 +1,4 @@
-# https://github.com/marketplace/actions/gradle-wrapper-validation
+# https://github.com/gradle/actions/tree/main/wrapper-validation
 
 name: 'Validate Gradle Wrapper'
 
@@ -10,4 +10,4 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v5
-      - uses: gradle/wrapper-validation-action@v3
+      - uses: gradle/actions/wrapper-validation@v5