Pin label-check reusable workflow to a commit SHA

[bharvey88]

Version: 26.3.2.1 (unchanged, workflow only)

What does this implement/fix?

Pins the ApolloAutomation/Workflows/.github/workflows/label-check.yml reusable workflow reference from the mutable @main ref to the current reviewed commit SHA, matching how the repo already pins third-party actions. label-check runs on pull_request_target with a write token, so a change to the Workflows repo silently changed what runs privileged here. The build.yml reference is pinned separately in #37, so this PR covers the remaining ref on beta.

Trade-off: future Workflows updates need a pin bump in this repo.

Types of changes

• Bugfix (fixed change that fixes an issue)
• New feature (thanks!)
• Breaking change (repair/feature that breaks existing functionality)
• Dependency Update - Does not publish
• Other - Does not publish
• Website of github readme file update - Does not publish
• Github workflows - Does not publish

Checklist / Checklijst:

• The code change has been tested and works locally
• The code change has not yet been tested

If user-visible functionality or configuration variables are added/modified:

• Added/updated documentation for the web page

🤖 Generated with Claude Code

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: b7e3d0ad-2dc4-4bbc-b346-0a19f5d37ff4

📥 Commits

Reviewing files that changed from the base of the PR and between 6b097fa and 5901eb0.

📒 Files selected for processing (1)

• .github/workflows/label-check.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/pin-workflows-sha

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