actions/checkout @ v6

zrkadlo https://github.com/actions/checkout

Yashwanth Anantharaju 1cce3390c2 Fix checkout init for SHA-256 repositories (#2439)		3 týždňov pred
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index.js	1cce3390c2 Fix checkout init for SHA-256 repositories (#2439)	3 týždňov pred
problem-matcher.json	e347bba93b Convert checkout to a regular action (#70)	6 rokov pred