Update actions/stale action to v9

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/stale	action	major	v8.0.0 -> v9.0.0

---

Release Notes

actions/stale (actions/stale)

v9.0.0

Compare Source

Breaking Changes

1. 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.
2. 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

1. Performance optimization that removes unnecessary API calls by @​dsame #​1033 fixes #​792
2. 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 https://github.com/actions/stale/pull/984
• @​nikolai-laevskii made their first contribution in https://github.com/actions/stale/pull/1020
• @​dusan-trickovic made their first contribution in https://github.com/actions/stale/pull/1056
• @​aparnajyothi-y made their first contribution in https://github.com/actions/stale/pull/1110

Full Changelog: actions/stale@v8...v9.0.0

---

Configuration

📅 Schedule: Branch creation - "after 7am and before 11am every weekday" in timezone Europe/London, Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.