Prep for Flutter 3.19 release #5107

Job	Run time
ios-build	13m 6s
android-build	11m 9s
Test Flutter stable on ubuntu-latest	17m 43s
Test Flutter stable on macos-latest	37m 7s
Test Flutter stable on windows-latest	23m 59s
web/samples_index config check	57s
Test Flutter beta on ubuntu-latest	15m 4s
Test Flutter beta on macos-latest	23m 14s
Test Flutter beta on windows-latest	21m 31s
Test Flutter master on ubuntu-latest	12m 22s
Test Flutter master on macos-latest	27m 39s
Test Flutter master on windows-latest	18m 47s
	3h 42m 38s

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