CI: migrate to the wrapper-validation action

As documented by the wrapper-validation-action's release notes.

Author: ForNeVeR

.github/workflows/main.yml

@@ -27,7 +27,7 @@ jobs:
           java-version: '17'
 
       - name: "Validate Gradle wrapper"
-        uses: gradle/wrapper-validation-action@v3
+        uses: gradle/actions/wrapper-validation@v3
 
       - name: Setup Gradle
         uses: gradle/actions/setup-gradle@v3