Bump actions/checkout from 4 to 6 #21

Job	Run time
CLI	50s
OCI Implementation Registry Compatibility	1m 10s
Tests Matrix (src/test/cli.build.test.ts)	10m 47s
Tests Matrix (src/test/container-features/containerFeaturesOrder.test.ts)	1m 10s
Tests Matrix (src/test/cli.exec.buildKit.2.test.ts)	5m 55s
Tests Matrix (src/test/cli.exec.buildKit.1.test.ts)	5m 14s
Tests Matrix (src/test/cli.podman.test.ts)	2m 47s
Tests Matrix (src/test/container-features/containerFeaturesOCIPush.test.ts)	59s
Tests Matrix (--exclude src/test/container-features/containerFeaturesOrder.test.ts --exclude src/...	7m 11s
Tests Matrix (src/test/cli.up.test.ts)	5m 20s
Tests Matrix (src/test/cli.exec.nonBuildKit.2.test.ts)	5m 7s
Tests Matrix (src/test/cli.exec.nonBuildKit.1.test.ts)	5m 10s
Tests Matrix (src/test/imageMetadata.test.ts)	6m 48s
Tests Matrix (src/test/container-features/featuresCLICommands.test.ts)	3m 6s
Tests Matrix (src/test/cli.test.ts)	1m 9s
Tests Matrix (src/test/container-features/e2e.test.ts)	4m 38s
Tests	2s
	1h 7m 23s

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