fix google map pubspec

[google_maps_flutter] Fix for bitmap scaling (flutter#1821)

[google_sign_in] update to androidx (flutter#2611)

[package_info, sensors] Announce API stability and compatibility with…

… 1.0.0 (flutter#2604)

[package_info, sensors] Announce API stability and compatibility with…

… 1.0.0 (flutter#2604)

[google_sign_in_web] Remove fakeConstructor$ from generated API. (flu…

…tter#2602)

JS interop classes do not support non-external constructors.

[google_sign_in] Add new Oauth scope methods to google_sign_in_platfo…

…rm_interface. (flutter#2547)

[battery] Announce API stability and compatibility with 1.0.0 (flutte…

…r#2597)

[in_app_purchase] Android: fix potential crash when casting in v1 emb…

…edding. (flutter#2585)

[connectivity] remove ios workspace setting for example app. (flutter…

…#2592)