Update actions/checkout action to v6

[juul-mobile-bot]

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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Configuration

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[github-actions]

Test Results

 75 files   75 suites   9s ⏱️
458 tests 447 ✅ 11 💤 0 ❌
475 runs  459 ✅ 16 💤 0 ❌

Results for commit ad36935.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.79%. Comparing base (482b3d5) to head (ad36935).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #510   +/-   ##
=======================================
  Coverage   69.79%   69.79%           
=======================================
  Files           9        9           
  Lines          96       96           
  Branches        5        5           
=======================================
  Hits           67       67           
  Misses         26       26           
  Partials        3        3           

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