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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Configuration

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Summary by CodeRabbit

• Chores
  • Updated CI/CD infrastructure caching to the latest version for improved build efficiency and reliability.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: d5a6c8d2-cf9f-40c5-a6e9-0d2985a325b3

📥 Commits

Reviewing files that changed from the base of the PR and between 14a9a90 and 9036339.

📒 Files selected for processing (2)

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

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📝 Walkthrough

Walkthrough

Two GitHub Actions files update their actions/cache references from v5 to v6: the composite artifact-cache action's restore step and the pip cache step in the agents-auto-pilot workflow. No cache paths, keys, or other configuration values are modified.

Changes

actions/cache v5 → v6 upgrade

Layer / File(s)	Summary
actions/cache version bump .github/actions/artifact-cache/action.yml, .github/workflows/agents-auto-pilot.yml	Both files update the uses: actions/cache reference from @v5 to @v6; all surrounding cache configuration (path, key, restore-keys) remains unchanged.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Suggested reviewers

• stranske

✨ 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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_{Comment @coderabbitai help to get the list of available commands.}

[agents-workflows-bot]

Workflow source needed

PR #376 needs either a linked GitHub issue or one valid non-issue Workflow Source before PR metadata automation can manage it safely.

Please do one of:

• Add <!-- meta:issue:123 --> or a normal Closes #123 / Related to #123 line.
• Check one Workflow Source option in the PR body.
• Add a hidden marker such as <!-- workflow-source:local_request -->, <!-- workflow-source:manual_remote -->, <!-- workflow-source:review_followup -->, <!-- workflow-source:sync_campaign -->, or <!-- workflow-source:dependabot -->.
• Add a workflow source label such as workflow:source-direct-pr, workflow:source-local-request, workflow:source-review-followup, workflow:source-sync, or workflow:no-automation.

Once a valid source is present, this warning will not be reposted.

[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: superseded by stranske/Workflows#2520, which updates actions/cache v6 in the Workflows source/template before Maint 68 syncs consumers. Direct consumer PRs for synced workflow files would create ownership drift; the replacement should come from the Workflows source PR and the next Maint 68 sync wave.

[renovate]

Renovate Ignore Notification

Because you closed this PR without merging, Renovate will ignore this update. You will not get PRs for any future 6.x releases. But if you manually upgrade to 6.x then Renovate will re-enable minor and patch updates automatically.

If you accidentally closed this PR, or if you changed your mind: rename this PR to get a fresh replacement PR.