Bump ffigen from 13.0.0 to 16.1.0 in /flutter_local_notifications_windows #371

Job	Run time
Run Dart Analyzer	1m 24s
Build Android example app (3.19)	4m 11s
Build Android example app (stable channel)	4m 34s
Dart formatting checks	1m 16s
Build iOS example app (3.19)	9m 17s
Build iOS example app (stable channel)	4m 29s
Build macOS example app (stable channel)	4m 48s
Build Linux example app (3.19)	1m 57s
Build Linux example app (stable channel)	3m 4s
Build macOS example app (3.19)	4m 34s
Build Windows example app (3.19)	4m 55s
Build Windows example app (stable channel)	6m 32s
Run all unit tests (Android)	4m 54s
Run all unit tests except for Windows (Dart)	1m 25s
Run Windows unit tests (Dart)	2m 56s
Run integration tests (Android)	5m 26s
Run integration tests (iOS)	15m 6s
	1h 20m 48s

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