chore(deps): bump actions/upload-artifact from 4 to 6

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 4 to 6.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v4...v6)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  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/ci.yml

@@ -57,7 +57,7 @@ jobs:
 
     - name: Archive test results
       if: always()
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@v6
       with:
         name: test-results-java-${{ matrix.java }}
         path: |
@@ -67,7 +67,7 @@ jobs:
 
     - name: Archive code coverage results
       if: matrix.java == '21'
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@v6
       with:
         name: code-coverage-report
         path: build/reports/jacoco/

.github/workflows/publish.yml

@@ -40,7 +40,7 @@ jobs:
         ORG_GRADLE_PROJECT_signingPassword: ${{ secrets.GPG_PASSPHRASE }}
 
     - name: Upload build artifacts
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@v6
       with:
         name: build-artifacts
         path: |