Update actions/checkout action to v5

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	major	v3 -> v5
actions/checkout	action	major	v4 -> v5
actions/checkout	action	major	v2 -> 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 https://github.com/actions/checkout/pull/1941
• Expand unit test coverage for isGhes by @​jww3 in https://github.com/actions/checkout/pull/1946

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (9d392bb) to head (60bb458).

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #50   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           22        22           
  Lines         1199      1199           
=========================================
  Hits          1199      1199           

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