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

@@ -319,7 +319,7 @@ jobs:
        distribution: temurin
        java-version: 17
    - name: set up Gradle
-     uses: gradle/actions/setup-gradle@v5
+     uses: gradle/actions/setup-gradle@v6
    - name: set up flatc
      run: |
        cmake -DFLATBUFFERS_BUILD_TESTS=OFF -DFLATBUFFERS_BUILD_FLATLIB=OFF -DFLATBUFFERS_BUILD_FLATHASH=OFF -DFLATBUFFERS_STRICT_MODE=ON .
@@ -399,7 +399,7 @@ jobs:
         distribution: temurin
         java-version: 17
     - name: set up Gradle
-      uses: gradle/actions/setup-gradle@v5
+      uses: gradle/actions/setup-gradle@v6
     - name: Build flatc
       run: |
        cmake -DFLATBUFFERS_BUILD_TESTS=OFF -DFLATBUFFERS_BUILD_FLATLIB=OFF -DFLATBUFFERS_BUILD_FLATHASH=OFF .
@@ -422,7 +422,7 @@ jobs:
         distribution: temurin
         java-version: 17
     - name: set up Gradle
-      uses: gradle/actions/setup-gradle@v5
+      uses: gradle/actions/setup-gradle@v6
     - name: Build flatc
       run: |
        cmake -DFLATBUFFERS_BUILD_TESTS=OFF -DFLATBUFFERS_BUILD_FLATLIB=OFF -DFLATBUFFERS_BUILD_FLATHASH=OFF .