Bump the github-actions group with 2 updates

Bumps the github-actions group with 2 updates: [actions/checkout](https://github.com/actions/checkout) and [gradle/gradle-build-action](https://github.com/gradle/gradle-build-action).


Updates `actions/checkout` from 3 to 4
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v3...v4)

Updates `gradle/gradle-build-action` from 2.7.1 to 2.8.0
- [Release notes](https://github.com/gradle/gradle-build-action/releases)
- [Commits](https://github.com/gradle/gradle-build-action/compare/v2.7.1...v2.8.0)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: github-actions
- dependency-name: gradle/gradle-build-action
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: github-actions
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/demo-failure-cases.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout sources
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
     - name: Test build failure
       uses: ./
       continue-on-error: true
@@ -21,7 +21,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout sources
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
     - name: Test wrapper missing
       uses: ./
       continue-on-error: true
@@ -33,7 +33,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout sources
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
     - name: Test bad config value
       uses: ./
       continue-on-error: true