Bump ffigen from 13.0.0 to 16.0.0 in /flutter_local_notifications_windows #310

Job	Run time
Run Dart Analyzer	1m 12s
Build Android example app (3.19)	3m 28s
Build iOS example app (3.19)	2m 0s
Build Android example app (stable channel)	4m 18s
Build iOS example app (stable channel)	5m 13s
Build Linux example app (3.19)	1m 16s
Build Linux example app (stable channel)	1m 50s
Build macOS example app (3.19)	3m 3s
Build macOS example app (stable channel)	4m 48s
Dart formatting checks	1m 10s
Build Windows example app (3.19)	4m 3s
Build Windows example app (stable channel)	4m 3s
Run integration tests (Android)	5m 13s
Run integration tests (iOS)	15m 50s
Run all unit tests (Android)	4m 41s
Run all unit tests except for Windows (Dart)	1m 27s
Run Windows unit tests (Dart)	3m 44s
	1h 7m 19s

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