Merge pull request #15 from gokken-roko/renovate/actions-stale-6.x

Update actions/stale action to v6

Author: gokken-roko

.github/workflows/stale.yaml

@@ -7,7 +7,7 @@ jobs:
   stale:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/stale@v5
+      - uses: actions/stale@v6
         with:
           only-labels: "triage/stale-test"
           stale-issue-message: |