build(deps): bump actions/upload-artifact from 5 to 6 (kroxylicious#3061)

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/lint.yaml

@@ -55,7 +55,7 @@ jobs:
         run: echo ${{ github.event.number }} > PR_NUMBER.txt
       - name: Archive PR number
         if: github.event_name == 'pull_request'
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: PR_NUMBER
           path: PR_NUMBER.txt

.github/workflows/operator-maven.yaml

@@ -97,7 +97,7 @@ jobs:
         run: echo ${{ github.event.number }} > PR_NUMBER.txt
       - name: Archive PR number
         if: github.event_name == 'pull_request'
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: PR_NUMBER
           path: PR_NUMBER.txt

.github/workflows/stage_release.yaml

@@ -161,7 +161,7 @@ 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