chore: update metrics/flutter.properties to 3.19.6 (#1995) #465

Job	Run time
cancel-previous-workflow	4s
android \| ubuntu-latest \| stable	1m 5s
android \| ubuntu-latest \| beta	1m 7s
linux \| ubuntu-latest \| stable	1m 35s
linux \| ubuntu-latest \| beta	1m 26s
ios \| macos-latest \| stable	2m 19s
macos \| macos-latest \| stable	1m 33s
windows \| windows-latest \| stable	2m 14s
windows \| windows-latest \| beta	2m 38s
analyze / analyze	2m 7s
analyze / cancel-previous-workflow	4s
analyze / package-analysis	2m 8s
	18m 20s

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