Merge pull request #19 from canonical/renovate/major-github-artifact-actions

chore(deps): update actions/upload-artifact action to v6

Author: vicamo

.github/workflows/shared-kernel-builder.yml

@@ -80,7 +80,7 @@ jobs:
       - name: Upload artifacts
         if: ${{ !cancelled() }}
         id: artifacts
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: ${{ inputs.artifacts-name }}
           path: |