Upgrade syncthing to v1.21.0

• Update the bundled syncthing to v1.21.0

Upgrade syncthing to v1.20.4

• This release updates the bundled syncthing to v1.20.4

Upgrade syncthing to v1.20.3

• This release updates the bundled syncthing to v1.20.3

Upgrade syncthing to v1.20.2

• This release updates the bundled syncthing to v1.20.2

Upgrade syncthing to v1.20.1

• This release updates the bundled syncthing to v1.20.1

Upgrade syncthing to v1.20.0

• This release updates the bundled syncthing to v1.20.0

Upgrade syncthing to v1.19.2

• This release updates the bundled syncthing to v1.19.2

Upgrade syncthing to v1.19.1

• This release updates the bundled syncthing to v1.19.1

Upgrade syncthing to v1.19.0

• This release updates the bundled syncthing to v1.19.0

Minor improvements

• Add preference for hiding the menu bar icon (#143)
• Improve menu bar tooltip for use with Voice Control (#171)
• Improve pause state handling displaying correct tray icon