Bump actions/stale from 8 to 9 (#36)

Bumps actions/stale from 8 to 9.

Release notes
Sourced from actions/stale's releases.

v9.0.0
Breaking Changes
Action is now stateful: If the action ends because of operations-per-run then the next run will start from the first unprocessed issue skipping the issues processed during the previous run(s). The state is reset when all the issues are processed. This should be considered for scheduling workflow runs.
Version 9 of this action updated the runtime to Node.js 20. All scripts are now run with Node.js 20 instead of Node.js 16 and are affected by any breaking changes between Node.js 16 and 20.
What Else Changed
Performance optimization that removes unnecessary API calls by @​dsame #1033 fixes #792
Logs displaying current github API rate limit by @​dsame #1032 addresses #1029
For more information, please read the action documentation and its section about statefulness

New Contributors
@​jmeridth made their first contribution in actions/stale#984
@​nikolai-laevskii made their first contribution in actions/stale#1020
@​dusan-trickovic made their first contribution in actions/stale#1056
@​aparnajyothi-y made their first contribution in actions/stale#1110
Full Changelog: actions/stale@v8...v9.0.0

.github/workflows/triage.yml

@@ -16,7 +16,7 @@ jobs:
   stale:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/stale@v8
+      - uses: actions/stale@v9
         with:
           days-before-stale: 30