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](https://github.com/gradle/actions/compare/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>

.github/workflows/build.yml

@@ -60,7 +60,7 @@ jobs:
           java-version: '17'
           distribution: 'adopt'
       - name: Setup Gradle
-        uses: gradle/actions/setup-gradle@v5
+        uses: gradle/actions/setup-gradle@v6
       - name: Java Spotless Check
         run: ./gradlew spotlessCheck --build-cache
 
@@ -81,7 +81,7 @@ jobs:
           java-version: '17'
           distribution: 'adopt'
       - name: Setup Gradle
-        uses: gradle/actions/setup-gradle@v5
+        uses: gradle/actions/setup-gradle@v6
       - name: Build ShadowJar
         run: ./gradlew :server:desktop:shadowJar --build-cache
       - name: Test with Gradle
@@ -217,7 +217,7 @@ jobs:
           java-version: '17'
           distribution: 'adopt'
       - name: Setup Gradle
-        uses: gradle/actions/setup-gradle@v5
+        uses: gradle/actions/setup-gradle@v6
       - name: Download GUI Dist
         uses: actions/download-artifact@v6
         with: