deps: update actions/checkout action to v6.0.3

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	patch	v6.0.2 → v6.0.3

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Release Notes

actions/checkout (actions/checkout)

v6.0.3

Compare Source

• Fix checkout init for SHA-256 repositories by @​yaananth in #​2439
• fix: expand merge commit SHA regex and add SHA-256 test cases by @​yaananth in #​2414

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.43%. Comparing base (33f9795) to head (cb0987c).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main   #11931   +/-   ##
=========================================
  Coverage     58.43%   58.43%           
  Complexity     1809     1809           
=========================================
  Files           361      361           
  Lines         13499    13499           
  Branches       1383     1383           
=========================================
  Hits           7888     7888           
  Misses         5115     5115           
  Partials        496      496           

Flag	Coverage Δ
funTest-external-tools	14.64% <ø> (ø)
funTest-no-external-tools	30.40% <ø> (ø)
test-ubuntu-24.04	41.78% <ø> (ø)
test-windows-2025	41.76% <ø> (ø)

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