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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[github-actions]

SpotBugs

Category	Base	New
Bad practice	34	34
Correctness	29	29
Dodgy code	15	15
Internationalization	6	6
Malicious code vulnerability	26	26
Multithreaded correctness	11	11
Performance	9	9
Total	130	130