Update actions/checkout action to v6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	major	v5 → v6

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Release Notes

actions/checkout (actions/checkout)

v6

Compare Source

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1. .github/workflows/ci.yml:33

• Draft comment:
  Updated checkout action to v6. Verify that the new defaults (like fetch-depth or submodule handling) suit your workflow. Consider using the version tag (e.g., actions/checkout@v6) for clarity.
• Reason this comment was not posted:
  Confidence changes required: 33% <= threshold 50% None

2. .github/workflows/devcontainer.yml:35

• Draft comment:
  Updated checkout action to v6. Ensure that any changes in default behavior from v5 (e.g., token handling or fetch-depth) are acceptable. Consider referencing the release tag directly.
• Reason this comment was not posted:
  Confidence changes required: 33% <= threshold 50% None

Workflow ID: wflow_eVYjlXD59TJEr5ws

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