livecheck: Add ExtractPlist skip to SkipConditions #26586

Job	Run time
syntax	1m 29s
formula audit	7m 8s
tap syntax	7m 57s
cask audit	2m 32s
docker	4m 13s
tests (online)	7m 34s
update-test (Ubuntu 22.04)	1m 4s
vendored gems	32s
tests (generic OS)	5m 26s
update-test (macOS 13)	55s
tests (Ubuntu 22.04)	6m 0s
test default formula (Ubuntu 22.04)	4m 42s
tests (Ubuntu 20.04)	6m 19s
test default formula (Ubuntu 20.04)	5m 49s
tests (macOS 13 x86_64)	8m 35s
test default formula (macOS 13 x86_64)	2m 34s
tests (macOS 14 arm64)	7m 44s
test default formula (macOS 14 arm64)	1m 24s
	1h 21m 57s

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