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:
  Update to actions/checkout@v6 looks correct. Please verify that any changed defaults (like fetch-depth or submodules) don’t affect the linters run.
• Reason this comment was not posted:
  Confidence changes required: 33% <= threshold 50% None

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

• Draft comment:
  Updated to checkout@v6; ensure that any new defaults or behavioral changes in v6 do not impact the release workflow.
• Reason this comment was not posted:
  Confidence changes required: 33% <= threshold 50% None

3. .github/workflows/test.yml:19

• Draft comment:
  Updated checkout to v6 in the test workflow. Confirm that the changes in checkout@v6 (if any) do not interfere with test setup in both the 'go' and 'go-mod-tidy' jobs.
• Reason this comment was not posted:
  Confidence changes required: 33% <= threshold 50% None

Workflow ID: wflow_pkf5OGjJKcuQBN4H

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