Bump actions/upload-artifact from 5 to 6 (#560)

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/maven.yaml

@@ -84,13 +84,13 @@ jobs:
 
       - name: Archive PR number
         if: github.event_name == 'pull_request' && ${{ matrix.os }} == 'ubuntu-latest'
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: PR_NUMBER
           path: PR_NUMBER.txt
 
       - name: Archive container logs
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         if: failure()
         with:
           name: container-logs
@@ -143,7 +143,7 @@ jobs:
         run: TEST_CLUSTER_EXECUTION_MODE=CONTAINER mvn -Dmaven.main.skip=true -Dmaven.javadoc.skip=true -pl impl -B test -Dtest=KafkaClusterTest -Dkafka.version=${{ matrix.version }}
 
       - name: Archive container logs
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         if: failure()
         with:
           name: container-logs

.github/workflows/stage_release.yaml

@@ -150,7 +150,7 @@ jobs:
               '$ARGS.named' > RELEASE_STATE.json
       
       - name: 'Archive release state (used by the promote workflow)'
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: RELEASE_STATE.json
           path: RELEASE_STATE.json