actions/checkout @ releases/v4

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

eric sciple 34e114876b Cleanup actions/checkout@v6 auth style (#2305)		7 mesiacov pred
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index.js	34e114876b Cleanup actions/checkout@v6 auth style (#2305)	7 mesiacov pred
problem-matcher.json	e347bba93b Convert checkout to a regular action (#70)	6 rokov pred