Log Message:
stellarium: updated to 0.21.1

0.21.1 [2021-06-24]
The major changes of this version:
- Updated designations of stars and handling of list of designations
  and common names those stars
- Updated Almagest and al-Sufi skycultures
- Many changes in plugins
- Many fixes in core and plugins for support HiDPI devices
- Enhancements in visualization of markings and in scripting engine