Run `flutter pub get` for `flutter/microbenchmarks` #5717

Job	Run time
macos \| stable	57s
cancel-previous-workflow	3s
macos \| beta	41s
ubuntu \| stable	44s
ubuntu \| beta	35s
windows \| stable	1m 45s
windows \| beta	1m 42s
analyze / cancel-previous-workflow	4s
analyze / analyze	46s
analyze / package-analysis	1m 38s
	8m 55s

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