chore(deps): update sigstore/cosign-installer action to v3.6.0 #1666

Job	Run time
build-base (39, base)	8m 24s
build-base (39, silverblue)	7m 21s
build-base (39, kinoite)	10m 1s
build-base (40, base)	7m 10s
build-base (40, silverblue)	7m 20s
build-base (40, kinoite)	8m 52s
build-base (stable, base)	10m 19s
build-base (stable, silverblue)	10m 29s
build-base (stable, kinoite)	11m 21s
build-nvidia (39, base)	7m 54s
build-nvidia (39, silverblue)	9m 29s
build-nvidia (39, kinoite)	10m 16s
build-nvidia (40, base)	7m 31s
build-nvidia (40, silverblue)	7m 39s
build-nvidia (40, kinoite)	11m 24s
build-nvidia (stable, base)	7m 52s
build-nvidia (stable, silverblue)	7m 54s
build-nvidia (stable, kinoite)	9m 22s
check	5s
	2h 40m 43s

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