chore(deps): update actions/checkout action to v5

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	major	v3 -> v5

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Release Notes

actions/checkout (actions/checkout)

v5

Compare Source

v4

Compare Source

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

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Configuration

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.83%. Comparing base (130ab8a) to head (7b74cdc).
⚠️ Report is 15 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #253      +/-   ##
==========================================
- Coverage   87.01%   84.83%   -2.19%     
==========================================
  Files           5        4       -1     
  Lines         208      178      -30     
  Branches       58       61       +3     
==========================================
- Hits          181      151      -30     
  Misses         27       27              

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