geos: 3.6.1 -> 3.6.2

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

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

These checks were done:

- built on NixOS
- ran ‘/nix/store/17821mvnx0ilvicbzxvli6jq58fg7yy6-geos-3.6.2/bin/geos-config --version’ and found version 3.6.2
- found 3.6.2 with grep in /nix/store/17821mvnx0ilvicbzxvli6jq58fg7yy6-geos-3.6.2
- directory tree listing: https://gist.github.com/bf03d4beea8e52684689747456f95948