Set GitHub labeler action to v4

[IanMadd]

Description

The GitHub Labeler action was updated with breaking changes. This config was pulling from the main branch, so it now goes 💥 on every PR.

This pins it to v4 so it will work again.

Issues Resolved

[List any existing issues this PR resolves, or any Discourse or StackOverflow discussions that are relevant]

Check List

• [ ] New functionality includes tests
• [ ] All buildkite tests pass
• [ ] Full omnibus build and tests in buildkite pass
• [ ] All commits have been signed-off for the Developer Certificate of Origin. See https://github.com/chef/chef/blob/main/CONTRIBUTING.md#developer-certification-of-origin-dco
• [ ] PR title is a worthy inclusion in the CHANGELOG

[netlify[bot]]

👷 Deploy Preview for chef-server processing.

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[sonarqubecloud[bot]]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud