chore: update flutter/scripts/update-cocoa.sh to 8.45.0 (#2718) #1869

Job	Run time
cancel-previous-workflow	4s
macos \| stable	1m 16s
macos \| beta	1m 25s
linux \| stable	1m 54s
linux \| beta	1m 34s
windows \| stable	4m 17s
windows \| beta	3m 45s
analyze / analyze	1m 35s
analyze / cancel-previous-workflow	5s
analyze / package-analysis	1m 37s
	17m 32s

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