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/dependency-submission.yml

@@ -19,4 +19,4 @@ jobs:
           distribution: 'temurin'
           java-version: 17
       - name: Generate and submit dependency graph
-        uses: gradle/actions/dependency-submission@v5
+        uses: gradle/actions/dependency-submission@v6

.github/workflows/manual-checks.yml

@@ -42,9 +42,9 @@ jobs:
         env:
           SECRETS_GPG_COMMAND: gpg2
       - name: Validate Gradle wrapper
-        uses: gradle/actions/wrapper-validation@v5
+        uses: gradle/actions/wrapper-validation@v6
       - name: Setup Gradle
-        uses: gradle/actions/setup-gradle@v5
+        uses: gradle/actions/setup-gradle@v6
         with:
           gradle-home-cache-strict-match: true