chore(github-tag): update tag actions/cache to v6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/cache	action	major	v5.1.0 → v6.1.0

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Release Notes

actions/cache (actions/cache)

v6.1.0

Compare Source

What's Changed

• Bump @​actions/cache to v6.1.0 - handle read-only cache access by @​jasongin in #​1768

Full Changelog: actions/cache@v6...v6.1.0

v6.0.0

Compare Source

What's Changed

• Update packages, migrate to ESM by @​Samirat in #​1760

Full Changelog: actions/cache@v5...v6.0.0

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📝 Walkthrough

Walkthrough

Changes

CI cache action update

Layer / File(s)	Summary
Update Docker layer cache action .github/workflows/ci.yaml	The devcontainer test job now uses actions/cache v6.1.0 instead of v5.1.0.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~2 minutes

Change: Other

Suggested reviewers: devsecninja

Merge Risk: ⚪ Minimal · up to 69980

This isolated cache-action upgrade is compatible with the workflow and introduces no identified merge-blocking risk.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the main change: updating the GitHub Actions actions/cache dependency to v6. The title is concise and related to the changeset.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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• Commit unit tests in branch renovate/actions-cache-6.x

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