3914 [google_sign_in] Migrate maven repo from jcenter to mavenCentral (cla: yes, waiting for tree to go green, p: google_sign_in, platform-android)

3915 [image_picker] Migrate maven repo from jcenter to mavenCentral (cla: yes, waiting for tree to go green, p: image_picker, platform-android)

3916 [in_app_purchase] Migrate maven repo from jcenter to mavenCentral (cla: yes, waiting for tree to go green, p: in_app_purchase, platform-android)

3917 [local_auth] Migrate maven repo from jcenter to mavenCentral (cla: yes, waiting for tree to go green, p: local_auth, platform-android)