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.yml

@@ -32,10 +32,10 @@ jobs:
           java-version: 25
 
       - name: Setup Gradle
-        uses: gradle/actions/setup-gradle@v5
+        uses: gradle/actions/setup-gradle@v6
 
       - name: Gradle Wrapper Validation
-        uses: gradle/actions/wrapper-validation@v5
+        uses: gradle/actions/wrapper-validation@v6
 
       - name: D-BUS AT-SPI Installation
         run: sudo apt-get -y install at-spi2-core

.github/workflows/gradle-dependency-submission.yml

@@ -19,7 +19,7 @@ jobs:
         distribution: temurin
         java-version: 25
     - name: Generate and submit dependency graph
-      uses: gradle/actions/dependency-submission@v5
+      uses: gradle/actions/dependency-submission@v6
       with:
         build-scan-publish: true
         build-scan-terms-of-use-url: "https://gradle.com/help/legal-terms-of-use"

.github/workflows/release.yml

@@ -49,7 +49,7 @@ jobs:
           java-version: 25
 
       - name: Gradle Setup
-        uses: gradle/actions/setup-gradle@v5
+        uses: gradle/actions/setup-gradle@v6
 
       - name: Update CITATION.cff
         if: inputs.stage == 'final'
@@ -128,7 +128,7 @@ jobs:
           java-version: 25
 
       - name: Setup Gradle
-        uses: gradle/actions/setup-gradle@v5
+        uses: gradle/actions/setup-gradle@v6
 
       - name: Package
         shell: bash