Release v3.3.0b9

Added

• Added hub.buttons as an alias for hub.button on buttons with one
  hub (support#1254).
• Implemented brake for DriveBase (support#881).

Changed

• The use_gyro method is added to the normal DriveBase class instead of
  having a separate GyroDriveBase class. Since the latter was only released
  in beta versions, this is not a breaking change (support#1054).
• New color distance function used by the color sensors that is more
  consistent when distinguishing user-provided colors (pybricks-micropython#104).
• Updated the unreleased BLE API to ensure sent and received objects are the
  same. Allows one of the supported types or a list/tuple thereof.

Fixed

• Improved external device detection speed (support#1140).
• Fixed Powered Up Tilt Sensor not working (support#1189).
• Fixed surface=False not working in ColorSensor (support#1232).
• Fixed PUPDevice.write not selecting correct mode (support#1213).
• Fixed City Hub turning back on after shutdown (support#1195).
• Fixed SPIKE hubs not broadcasting at all when attempting to broadcast in a
  tight loop (support#1151).