Update canonical/data-platform-workflows action to v21.0.1

[renovate[bot]]

This PR contains the following updates:

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

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Release Notes

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

### [`v21.0.1`](https://togithub.com/canonical/data-platform-workflows/releases/tag/v21.0.1) [Compare Source](https://togithub.com/canonical/data-platform-workflows/compare/v21.0.0...v21.0.1) ##### What's Changed - patch(build_\*.yaml): Switch ARM runner image by [@​carlcsaposs-canonical](https://togithub.com/carlcsaposs-canonical) in [https://github.com/canonical/data-platform-workflows/pull/233](https://togithub.com/canonical/data-platform-workflows/pull/233) **Full Changelog**: https://github.com/canonical/data-platform-workflows/compare/v21.0.0...v21.0.1

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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.

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

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