stellarium: 0.18.0 -> 0.18.1 (#42949)

Semi-automatic update generated by https://github.com/ryantm/nixpkgs-update tools.

This update was made based on information from https://repology.org/metapackage/stellarium/versions.

These checks were done:

- built on NixOS
- Warning: no invocation of /nix/store/2c607ylvxs69nbr99ly1bgcb0bbk47xf-stellarium-0.18.1/bin/stellarium had a zero exit code or showed the expected version
- Warning: no invocation of /nix/store/2c607ylvxs69nbr99ly1bgcb0bbk47xf-stellarium-0.18.1/bin/.stellarium-wrapped had a zero exit code or showed the expected version
- 0 of 2 passed binary check by having a zero exit code.
- 0 of 2 passed binary check by having the new version present in output.
- found 0.18.1 with grep in /nix/store/2c607ylvxs69nbr99ly1bgcb0bbk47xf-stellarium-0.18.1
- directory tree listing: https://gist.github.com/dd98359fb1214ae24bd70e291c1bc33d
- du listing: https://gist.github.com/67baedda5ffc1ad0aa064239cb503c2b