[image_picker_for_web] Bump version for NNBD stable (flutter#3635)

[google_sign_in] Bump app-facing version for NNBD stable (flutter#3637)

[extension_google_sign_in_as_googleapis_auth] Migrate to null safety (f…

…lutter#3642)

Migrates to NNBD.
Replaces Mockito-based fakes with test's Fake.

[file_selector_platform_interface]: Verify that extensions don't have…

… leading dots. (flutter#3451)

[extension_google_sign_in_as_googleapis_auth] Migrate to null safety (f…

…lutter#3642)

Migrates to NNBD.
Replaces Mockito-based fakes with test's Fake.

[wifi_info_flutter] null safety stable (flutter#3627)

[url_launcher] Added a note to the README (flutter#2031)

The action won't work on the simulator works on physical iOS device which was not mentioned here so it was added

Co-authored-by: Michael Klimushyn <[email protected]>
Co-authored-by: Stuart Morgan <[email protected]>

[url_launcher] Added a note to the README (flutter#2031)

The action won't work on the simulator works on physical iOS device which was not mentioned here so it was added

Co-authored-by: Michael Klimushyn <[email protected]>
Co-authored-by: Stuart Morgan <[email protected]>

[quick_action] fix delegate methods not called on iOS (flutter#3621)

[in_app_purchase] Add support for InApp subscription upgrade/downgrade (

flutter#2822)