mate.caja: 1.20.1 -> 1.21.0

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

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

These checks were done:

- built on NixOS
- ran ‘/nix/store/sssawkcdpbaprvkllgc2xyklribdizd2-caja-1.21.0/bin/caja -h’ got 0 exit code
- ran ‘/nix/store/sssawkcdpbaprvkllgc2xyklribdizd2-caja-1.21.0/bin/caja --help’ got 0 exit code
- ran ‘/nix/store/sssawkcdpbaprvkllgc2xyklribdizd2-caja-1.21.0/bin/caja-connect-server -h’ got 0 exit code
- ran ‘/nix/store/sssawkcdpbaprvkllgc2xyklribdizd2-caja-1.21.0/bin/caja-connect-server --help’ got 0 exit code
- ran ‘/nix/store/sssawkcdpbaprvkllgc2xyklribdizd2-caja-1.21.0/bin/.caja-wrapped -h’ got 0 exit code
- ran ‘/nix/store/sssawkcdpbaprvkllgc2xyklribdizd2-caja-1.21.0/bin/.caja-wrapped --help’ got 0 exit code
- ran ‘/nix/store/sssawkcdpbaprvkllgc2xyklribdizd2-caja-1.21.0/bin/.caja-connect-server-wrapped -h’ got 0 exit code
- ran ‘/nix/store/sssawkcdpbaprvkllgc2xyklribdizd2-caja-1.21.0/bin/.caja-connect-server-wrapped --help’ got 0 exit code
- found 1.21.0 with grep in /nix/store/sssawkcdpbaprvkllgc2xyklribdizd2-caja-1.21.0
- directory tree listing: https://gist.github.com/eed0de1f462096e2dbac08cdcb6344bd