mate.mate-sensors-applet: 1.20.1 -> 1.20.2

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

This update was made based on information from https://repology.org/metapackage/mate-sensors-applet/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 1.20.2 with grep in /nix/store/57vzc483bg7wbf8kx7xacsfyd2pa7d81-mate-sensors-applet-1.20.2
- directory tree listing: https://gist.github.com/b87e08ecd1269611cfc12caee03ec0a8
- du listing: https://gist.github.com/7ea36f0bc246d7aa8601097266a844c2