mate.libmateweather: 1.20.0 -> 1.20.1

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

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

These checks were done:

- built on NixOS

- 0 of 0 passed binary check by having a zero exit code.
- 0 of 0 passed binary check by having the new version present in output.
- found 1.20.1 with grep in /nix/store/h4792zpbkmkj75gzl056h8in9mwg651z-libmateweather-1.20.1
- directory tree listing: https://gist.github.com/3e9e247094f13369303bf230a02f3abe
- du listing: https://gist.github.com/a77cc48fd92236a8bb9c82f2f8c54a9b