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

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	major	v1 → v6

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Release Notes

actions/checkout (actions/checkout)

v6

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v5

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v4

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• url-helper.ts now leverages well-known environment variables by @​jww3 in #​1941
• Expand unit test coverage for isGhes by @​jww3 in #​1946

v3

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• Fix: Mark test scripts with Bash'isms to be run via Bash
• Add option to fetch tags even if fetch-depth > 0

v2

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• Fix default branch resolution for .wiki and when using SSH

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1. .github/workflows/linters.yml:10

• Draft comment:
  Updated checkout action to v6. Please verify that the new defaults (e.g. fetch-depth, LFS handling, etc.) align with our workflow requirements compared to v1.
• Reason this comment was not posted:
  Confidence changes required: 33% <= threshold 50% None

2. .github/workflows/release.yml:14

• Draft comment:
  The checkout step now uses actions/checkout@v6. Ensure any changes in default behavior (such as credential handling or fetch settings) do not impact the release process.
• Reason this comment was not posted:
  Confidence changes required: 33% <= threshold 50% None

3. .github/workflows/test.yml:15

• Draft comment:
  In the test workflow, the checkout action has been updated to v6. Confirm that no additional parameters are required and that its behavior remains consistent with the previous version.
• Reason this comment was not posted:
  Confidence changes required: 33% <= threshold 50% None

Workflow ID: wflow_8HEYFoKFEW1x5k3p

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