[libsass] Mark as no longer updated (#15413) #14617

Job	Run time
stubtest: stdlib (ubuntu-latest, 3.14)	40s
stubtest: stdlib (windows-latest, 3.10)	1m 26s
stubtest: stdlib (macos-latest, 3.11)	28s
stubtest: stdlib (macos-latest, 3.14)	1m 7s
stubtest: stdlib (macos-latest, 3.13)	55s
stubtest: stdlib (macos-latest, 3.10)	59s
stubtest: stdlib (ubuntu-latest, 3.10)	49s
stubtest: stdlib (windows-latest, 3.13)	1m 56s
stubtest: stdlib (macos-latest, 3.12)	48s
stubtest: stdlib (ubuntu-latest, 3.11)	1m 5s
stubtest: stdlib (ubuntu-latest, 3.12)	43s
stubtest: stdlib (windows-latest, 3.14)	1m 51s
stubtest: stdlib (windows-latest, 3.11)	2m 1s
stubtest: stdlib (windows-latest, 3.12)	1m 21s
stubtest: stdlib (ubuntu-latest, 3.13)	38s
	16m 47s

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