build(deps): bump subosito/flutter-action from 2.18.0 to 2.19.0 (#2826) #5847

Job	Run time
cancel-previous-workflow	4s
macos \| stable	4s
macos \| beta	5s
ubuntu \| stable	42s
ubuntu \| beta	31s
windows \| stable	1m 7s
windows \| beta	1m 8s
analyze / cancel-previous-workflow	5s
analyze / analyze	41s
analyze / package-analysis	1m 10s
	5m 37s

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