chore(deps): 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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Configuration

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🚦 Automerge: Enabled.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.10%. Comparing base (68d4c23) to head (37fba64).
⚠️ Report is 1 commits behind head on 0.7.x.

Additional details and impacted files

@@           Coverage Diff           @@
##            0.7.x     #184   +/-   ##
=======================================
  Coverage   95.10%   95.10%           
=======================================
  Files          10       10           
  Lines         184      184           
=======================================
  Hits          175      175           
  Misses          9        9           

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