Bump actions/upload-artifact from 5 to 6 (#8448)

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/pr-instructions.yml

@@ -30,7 +30,7 @@ jobs:
           echo ${{ steps.instruction.outputs.result }} > addingPrInstructions/artifact/artifact.txt
       
       - name: Upload Artifacts
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: adding-pr-instructions-artifact
           path: addingPrInstructions/artifact/

.github/workflows/set-pr-labels.yaml

@@ -39,7 +39,7 @@ jobs:
           echo ${{ steps.compile-labels.outputs.result }} > '${{ env.ARTIFACT_DIR }}/${{ env.ARTIFACT_FILE }}'
       - id: upload-labels-artifact
         name: 'Upload labels artifact'
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: pr-labels
           path: '${{ env.ARTIFACT_DIR }}/${{ env.ARTIFACT_FILE }}'