mate.engrampa: 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/engrampa/versions.

These checks were done:

- built on NixOS
- /nix/store/fk4bvvss8ciiw13halc37x6a4dpji36y-engrampa-1.20.1/bin/engrampa passed the binary check.
- /nix/store/fk4bvvss8ciiw13halc37x6a4dpji36y-engrampa-1.20.1/bin/.engrampa-wrapped passed the binary check.
- 2 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 1.20.1 with grep in /nix/store/fk4bvvss8ciiw13halc37x6a4dpji36y-engrampa-1.20.1
- directory tree listing: https://gist.github.com/b73375db196ecf4ade754cfc0ce3b7c8
- du listing: https://gist.github.com/ff5ea27db0db941cee563d428c065f42