chore: update flutter/scripts/update-cocoa.sh to 8.48.0 (#2820) #5634

Job	Run time
macos \| stable	1s
cancel-previous-workflow	4s
macos \| beta	1s
ubuntu \| stable	31s
ubuntu \| beta	20s
windows \| stable	40s
windows \| beta	1m 28s
analyze / analyze	39s
analyze / cancel-previous-workflow	6s
analyze / package-analysis	1m 34s
	5m 24s

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