geoclue2: 2.4.7 -> 2.4.8

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

This update was made based on information from https://repology.org/metapackage/geoclue/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 2.4.8 with grep in /nix/store/94izsg39mjz2f8z4wp0z4i2kxpwj8gv4-geoclue-2.4.8
- directory tree listing: https://gist.github.com/387fefa5c6ac00efbebe272c600f309f