Bump gradle/actions from 5 to 6

Bumps [gradle/actions](https://github.com/gradle/actions) from 5 to 6.
- [Release notes](https://github.com/gradle/actions/releases)
- [Commits](gradle/actions@v5...v6)

---
updated-dependencies:
- dependency-name: gradle/actions
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/pullrequest.yml

@@ -44,7 +44,7 @@ jobs:
         with:
           distribution: "adopt"
           java-version: ${{ matrix.java_version }}
-      - uses: gradle/actions/wrapper-validation@v5
+      - uses: gradle/actions/wrapper-validation@v6
       - name: Install Android SDK
         uses: hannesa2/action-android/install-sdk@0.1.16.7
       - name: Run instrumentation tests