Bump gradle/gradle-build-action from 2 to 3

Bumps [gradle/gradle-build-action](https://github.com/gradle/gradle-build-action) from 2 to 3.
- [Release notes](https://github.com/gradle/gradle-build-action/releases)
- [Commits](gradle/gradle-build-action@v2...v3)

---
updated-dependencies:
- dependency-name: gradle/gradle-build-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/alpha.yml

@@ -39,7 +39,7 @@ jobs:
         run: chmod +x ./gradlew
 
       - name: Build & assemble with gradle
-        uses: gradle/gradle-build-action@v2
+        uses: gradle/gradle-build-action@v3
         with:
           arguments: >
             build

.github/workflows/validate-gradle-build-test.yml

@@ -36,7 +36,7 @@ jobs:
         run: chmod +x ./gradlew
 
       - name: Build & test with Gradle
-        uses: gradle/gradle-build-action@v2
+        uses: gradle/gradle-build-action@v3
         with:
           arguments: >
             build
@@ -46,7 +46,7 @@ jobs:
 
       - name: Generate apk
         if: ${{ github.event_name == 'pull_request' }}
-        uses: gradle/gradle-build-action@v2
+        uses: gradle/gradle-build-action@v3
         with:
           arguments: >
             assemble${{ env.VARIANT }}