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. Verify that any behavioral changes in v6 (if any) are compatible with your linter workflow.
• Reason this comment was not posted:
  Confidence changes required: 33% <= threshold 50% None

2. .github/workflows/release.yml:13

• Draft comment:
  Updated checkout action to v6 for the initial code checkout. Ensure that any changes in default behaviors in v6 do not affect your release process.
• Reason this comment was not posted:
  Confidence changes required: 33% <= threshold 50% None

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

• Draft comment:
  Updated checkout action to v6 for checking out code into the Go module directory. Confirm that the directory structure and any required parameters remain valid.
• Reason this comment was not posted:
  Confidence changes required: 33% <= threshold 50% None

4. .github/workflows/test.yml:25

• Draft comment:
  Updated checkout action to v6 in the test workflow. Ensure that any checkout-specific options your tests rely on are still correctly configured.
• Reason this comment was not posted:
  Confidence changes required: 33% <= threshold 50% None

Workflow ID: wflow_VJbFv8XB0U4xBwMF

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