gqrx: 2.11.4 -> 2.11.5

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 invocation of /nix/store/cbn1yxw95q3ypja7bxzlm07z0zbfp9nc-gqrx-2.11.5/bin/gqrx had a zero exit code or showed the expected version
- 0 of 1 passed binary check by having a zero exit code.
- 0 of 1 passed binary check by having the new version present in output.
- found 2.11.5 with grep in /nix/store/cbn1yxw95q3ypja7bxzlm07z0zbfp9nc-gqrx-2.11.5
- directory tree listing: https://gist.github.com/45186a693bdf1b1c7ae2be1c9457ddf8
- du listing: https://gist.github.com/fe434d6ba0c5f72ef74629f65efea48f