Update canonical/data-platform-workflows action to v22

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
canonical/data-platform-workflows	action	major	v21.0.1 -> v22.0.0

---

Release Notes

canonical/data-platform-workflows (canonical/data-platform-workflows)

v22.0.0

Compare Source

What's Changed

• breaking(build_charm.yaml): Remove tox build wrapper support by @​carlcsaposs-canonical in https://github.com/canonical/data-platform-workflows/pull/236

Full Changelog: canonical/data-platform-workflows@v21...v22.0.0

Migration instructions

Only applicable if your charm repo has a tox build wrapper

1. Remove build wrapper
2. Override build in charm plugin in charmcraft.yaml to export poetry.lock to requirements.txt

Example: https://github.com/canonical/mysql-router-k8s-operator/pull/319

---

Configuration

📅 Schedule: Branch creation - "after 1am and before 3am every weekday" in timezone Etc/UTC, 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.