Update data-platform-workflows to v16.2.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
allure-pytest-collection-report	integration	patch	v16.2.0 -> v16.2.1
canonical/data-platform-workflows	action	patch	v16.2.0 -> v16.2.1
pytest-operator-cache	integration	patch	v16.2.0 -> v16.2.1
pytest-operator-groups	integration	patch	v16.2.0 -> v16.2.1

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Release Notes

canonical/data-platform-workflows (allure-pytest-collection-report)

### [`v16.2.1`](https://togithub.com/canonical/data-platform-workflows/releases/tag/v16.2.1) [Compare Source](https://togithub.com/canonical/data-platform-workflows/compare/v16.2.0...v16.2.1) ##### What's Changed - patch(\_sync_docs.yaml): Update source of gatekeeper action by [@​a-velasco](https://togithub.com/a-velasco) in [https://github.com/canonical/data-platform-workflows/pull/201](https://togithub.com/canonical/data-platform-workflows/pull/201) **Full Changelog**: https://github.com/canonical/data-platform-workflows/compare/v16.2.0...v16.2.1

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