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/build.yaml

@@ -21,6 +21,6 @@ jobs:
           distribution: adopt
           java-version: ${{ matrix.java-version }}
       - name: Validate Gradle wrapper
-        uses: gradle/actions/wrapper-validation@v5
+        uses: gradle/actions/wrapper-validation@v6
       - name: Build
         run: chmod +x ./gradlew && ./gradlew build --stacktrace

.github/workflows/publish.yaml

@@ -20,7 +20,7 @@ jobs:
           distribution: adopt
           java-version: ${{ matrix.java-version }}
       - name: Validate Gradle wrapper
-        uses: gradle/actions/wrapper-validation@v5
+        uses: gradle/actions/wrapper-validation@v6
       - name: Build
         run: chmod +x ./gradlew && ./gradlew build --stacktrace
   publish:
@@ -35,7 +35,7 @@ jobs:
           distribution: adopt
           java-version: 8
       - name: Validate Gradle wrapper
-        uses: gradle/actions/wrapper-validation@v5
+        uses: gradle/actions/wrapper-validation@v6
       - name: Publish
         run: chmod +x ./gradlew && ./gradlew publish && ./gradlew jreleaserFullRelease --stacktrace
         env: