ci(deps): update actions/checkout action to v6.0.1 #2132

Job	Run time
check-simulations-multiplatform (ubuntu-24.04)	2m 46s
check-simulations-multiplatform (macos-15)	3m 22s
check-simulations-multiplatform (windows-2025)	3m 56s
build-image	2m 59s
success	4s
	13m 7s

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