ci(deps): update actions/checkout action to v6.0.1 (#834) #2133

Job	Run time
check-simulations-multiplatform (macos-15)	2m 14s
check-simulations-multiplatform (windows-2025)	4m 41s
check-simulations-multiplatform (ubuntu-24.04)	2m 56s
build-image	3m 6s
success	2s
	12m 59s

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