chore(deps): update Flutter SDK (metrics) to v3.16.3 #21

Job	Run time
android \| ubuntu-latest \| stable	1m 6s
cancel-previous-workflow	4s
android \| ubuntu-latest \| beta	1m 4s
linux \| ubuntu-latest \| stable	1m 24s
linux \| ubuntu-latest \| beta	1m 32s
ios \| macos-latest \| stable	1m 33s
macos \| macos-latest \| stable	1m 38s
windows \| windows-latest \| stable	2m 25s
windows \| windows-latest \| beta	2m 20s
analyze / analyze	1m 48s
analyze / cancel-previous-workflow	4s
analyze / package-analysis	1m 1s
	15m 59s

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