main.yml: upgrade the wrapper validation action to v3 (#2257)

Author: stephengold

.github/workflows/main.yml

@@ -70,7 +70,7 @@ jobs:
         with:
           fetch-depth: 1
       - name: Validate the Gradle wrapper
-        uses: gradle/wrapper-validation-action@v2
+        uses: gradle/actions/wrapper-validation@v3
       - name: Build
         run: |
           ./gradlew -PuseCommitHashAsVersionName=true --no-daemon -PbuildNativeProjects=true \
@@ -124,7 +124,7 @@ jobs:
           path: build/native
 
       - name: Validate the Gradle wrapper
-        uses: gradle/wrapper-validation-action@v2
+        uses: gradle/actions/wrapper-validation@v3
       - name: Build Engine
         shell: bash
         run: |