ci(deps): bump actions/upload-artifact from 5 to 6 (#1035)

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 5 to 6.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v5...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] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -93,7 +93,7 @@ jobs:
         run: |
           tar czvf coatjava.tar.gz coatjava
           tar czvf clara.tar.gz clara
-      - uses: actions/upload-artifact@v5
+      - uses: actions/upload-artifact@v6
         with:
           name: build_${{ matrix.runner }}
           retention-days: 1
@@ -138,7 +138,7 @@ jobs:
         run: validation/jacoco-aggregate.sh
       - name: publish jacoco report
         if: ${{ matrix.JAVA_VERSION == env.JAVA_VERSION }}
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: jacoco_report
           path: publish/