stripe-android v13.1.0

• #2055 Fix styling of CardInputWidget and CardMultilineWidget
  • com.google.android.material:material:1.1.0-rc01 breaks TextInputLayout styling;
    fix by explicitly setting a style that extends Widget.Design.TextInputLayout
• #2056 Update CardInputWidget's EditText size
  • Fix "Postal Code" field being partially cut off on some screens
• #2066 Add support for uploading a file to Stripe
  • See Stripe#createFile() and Stripe#createFileSynchronous()
• #2071 Fix accessibility issues on Payment Methods selection screen
  • Mark Views representing existing payment methods and add a new payment method action as focusable and clickable

See the changelog for more details.