mate.mate-screensaver: 1.20.0 -> 1.20.1 (#42483)

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-screensaver/versions.

These checks were done:

- built on NixOS
- /nix/store/yl7p098lzcb2vs4hl4sxwgb0d37agvyd-mate-screensaver-1.20.1/bin/mate-screensaver passed the binary check.
- /nix/store/yl7p098lzcb2vs4hl4sxwgb0d37agvyd-mate-screensaver-1.20.1/bin/mate-screensaver-command passed the binary check.
- Warning: no invocation of /nix/store/yl7p098lzcb2vs4hl4sxwgb0d37agvyd-mate-screensaver-1.20.1/bin/mate-screensaver-preferences had a zero exit code or showed the expected version
- /nix/store/yl7p098lzcb2vs4hl4sxwgb0d37agvyd-mate-screensaver-1.20.1/bin/.mate-screensaver-wrapped passed the binary check.
- /nix/store/yl7p098lzcb2vs4hl4sxwgb0d37agvyd-mate-screensaver-1.20.1/bin/.mate-screensaver-command-wrapped passed the binary check.
- Warning: no invocation of /nix/store/yl7p098lzcb2vs4hl4sxwgb0d37agvyd-mate-screensaver-1.20.1/bin/.mate-screensaver-preferences-wrapped had a zero exit code or showed the expected version
- 4 of 6 passed binary check by having a zero exit code.
- 0 of 6 passed binary check by having the new version present in output.
- found 1.20.1 with grep in /nix/store/yl7p098lzcb2vs4hl4sxwgb0d37agvyd-mate-screensaver-1.20.1
- directory tree listing: https://gist.github.com/b700040ccf6edd3df78a2613f8827d45
- du listing: https://gist.github.com/cb5e756e8dc86af9c065a3b8545355f6