qutebrowser: 1.2.0 -> 1.2.1

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

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

These checks were done:

- built on NixOS
- ran `/nix/store/p9a5d6129dvx6gqbxn9fqgsmx7hnhwxb-qutebrowser-1.2.1/bin/qutebrowser -h` got 0 exit code
- ran `/nix/store/p9a5d6129dvx6gqbxn9fqgsmx7hnhwxb-qutebrowser-1.2.1/bin/qutebrowser --help` got 0 exit code
- ran `/nix/store/p9a5d6129dvx6gqbxn9fqgsmx7hnhwxb-qutebrowser-1.2.1/bin/..qutebrowser-wrapped-wrapped -h` got 0 exit code
- ran `/nix/store/p9a5d6129dvx6gqbxn9fqgsmx7hnhwxb-qutebrowser-1.2.1/bin/..qutebrowser-wrapped-wrapped --help` got 0 exit code
- ran `/nix/store/p9a5d6129dvx6gqbxn9fqgsmx7hnhwxb-qutebrowser-1.2.1/bin/.qutebrowser-wrapped -h` got 0 exit code
- ran `/nix/store/p9a5d6129dvx6gqbxn9fqgsmx7hnhwxb-qutebrowser-1.2.1/bin/.qutebrowser-wrapped --help` got 0 exit code
- found 1.2.1 with grep in /nix/store/p9a5d6129dvx6gqbxn9fqgsmx7hnhwxb-qutebrowser-1.2.1
- directory tree listing: https://gist.github.com/b85ebb5c38a8861cac255f78b5c16525