gqrx: 2.11.1 -> 2.11.2

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

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

These checks were done:

- built on NixOS
- Warning: no binary found that responded to help or version flags. (This warning appears even if the package isn't expected to have binaries.)
- found 2.11.2 with grep in /nix/store/h03z2vlzf1m2a30dqajpig2mj6gyq5dl-gqrx-2.11.2
- directory tree listing: https://gist.github.com/aaed3437121bb74ba827cff9fa2aecd1