chore(deps): update actions/cache action to v6

[renovate]

This PR contains the following updates:

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

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Release Notes

actions/cache (actions/cache)

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

v6

Compare Source

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📥 Commits

Reviewing files that changed from the base of the PR and between bfb81b0 and 4d09cea.

📒 Files selected for processing (2)

• .github/actions/artifact-cache/action.yml
• .github/workflows/agents-auto-pilot.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

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

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[github-actions]

Workflow state fingerprint for Agents Gate Followups. Do not edit.

[github-actions]

Workflow state fingerprint for Keepalive Loop Reporter. Do not edit.

[stranske]

Closing as superseded by stranske/Workflows#2520 and Maint 68 run 28048623743. Direct consumer PRs for Workflows-managed actions/cache files would create ownership drift; the replacement should come from the Workflows source and sync wave.

[renovate]

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