Bump gradle/gradle-build-action from 2.8.0 to 2.11.0

Bumps [gradle/gradle-build-action](https://github.com/gradle/gradle-build-action) from 2.8.0 to 2.11.0.
- [Release notes](https://github.com/gradle/gradle-build-action/releases)
- [Commits](gradle/gradle-build-action@ef76a97...8cbcb99)

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

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

.github/workflows/ci.yml

@@ -148,7 +148,7 @@ jobs:
           cache: gradle
 
       - name: Build
-        uses: gradle/gradle-build-action@ef76a971e2fa3f867b617efd72f2fbd72cf6f8bc # v2
+        uses: gradle/gradle-build-action@8cbcb9948b5892387aed077daf6f90e1f0ba5b27 # v2
         with:
           gradle-version: 1.12
           build-root-directory: picocli-tests-java567/