Run `flutter pub get` for `flutter/microbenchmarks` (#2779) #5718

Job	Run time
cancel-previous-workflow	4s
macos \| stable	48s
macos \| beta	54s
ubuntu \| stable	47s
ubuntu \| beta	36s
windows \| stable	1m 20s
windows \| beta	1m 5s
analyze / analyze	43s
analyze / cancel-previous-workflow	3s
analyze / package-analysis	1m 34s
	7m 54s

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