feat(github)!: Update actions/checkout (v4 → v6)

[lrstanley-x]

This PR contains the following updates:

Package	Type	Update	Change	OpenSSF
actions/checkout	action	major	v4 -> v6

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Release Notes

actions/checkout (actions/checkout)

v6

Compare Source

• Persist creds to a separate file by @​ericsciple in #​2286
• Update README to include Node.js 24 support details and requirements by @​salmanmkc in #​2248

v5

Compare Source

• Port v6 cleanup to v5 by @​ericsciple in #​2301

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Configuration

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PR generated using automation.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.23%. Comparing base (07961d7) to head (5b06eca).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #126      +/-   ##
==========================================
- Coverage   69.37%   69.23%   -0.14%     
==========================================
  Files          10       10              
  Lines        2436     2022     -414     
==========================================
- Hits         1690     1400     -290     
+ Misses        632      508     -124     
  Partials      114      114              

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