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:
  Upgrade to actions/checkout@v6 looks correct. Please verify that any changes in default behavior (e.g., fetch depth or LFS support) in v6 are compatible with these workflows.
• Reason this comment was not posted:
  Confidence changes required: 33% <= threshold 50% None

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

• Draft comment:
  The checkout steps have been updated to v6. Double-check that any new defaults in v6 don’t affect release note generation or other release steps.
• Reason this comment was not posted:
  Confidence changes required: 33% <= threshold 50% None

3. .github/workflows/test.yml:20

• Draft comment:
  The checkout action update to v6 is consistent here. Ensure that the new version’s behavior (e.g., default clone depth) remains aligned with the expectations for running tests.
• Reason this comment was not posted:
  Confidence changes required: 33% <= threshold 50% None

Workflow ID: wflow_SGPWDcrfks0gQCXJ

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