Bump pigeon from 21.2.0 to 22.4.0 in /add_to_app/books/flutter_module_books #914

Job	Run time
android-build	5m 57s
Test Flutter stable on ubuntu-latest	15m 54s
ios-build	12m 14s
Test Flutter stable on macos-latest	17m 21s
web/samples_index config check	48s
Test Flutter stable on windows-latest	24m 18s
Test Flutter beta on ubuntu-latest	2m 38s
Test Flutter beta on macos-latest	6m 2s
Test Flutter beta on windows-latest	5m 24s
Test Flutter master on ubuntu-latest	2m 49s
Test Flutter master on macos-latest	5m 49s
Test Flutter master on windows-latest	4m 51s
	1h 44m 5s

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