radicale: 2.1.8 -> 2.1.9

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

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

These checks were done:

- built on NixOS
- ran ‘/nix/store/rbymr2y0pbx8n8b8bfz2gscafmby904x-radicale-2.1.9/bin/.radicale-wrapped -h’ got 0 exit code
- ran ‘/nix/store/rbymr2y0pbx8n8b8bfz2gscafmby904x-radicale-2.1.9/bin/.radicale-wrapped --help’ got 0 exit code
- ran ‘/nix/store/rbymr2y0pbx8n8b8bfz2gscafmby904x-radicale-2.1.9/bin/.radicale-wrapped --version’ and found version 2.1.9
- ran ‘/nix/store/rbymr2y0pbx8n8b8bfz2gscafmby904x-radicale-2.1.9/bin/radicale -h’ got 0 exit code
- ran ‘/nix/store/rbymr2y0pbx8n8b8bfz2gscafmby904x-radicale-2.1.9/bin/radicale --help’ got 0 exit code
- ran ‘/nix/store/rbymr2y0pbx8n8b8bfz2gscafmby904x-radicale-2.1.9/bin/radicale --version’ and found version 2.1.9
- found 2.1.9 with grep in /nix/store/rbymr2y0pbx8n8b8bfz2gscafmby904x-radicale-2.1.9
- directory tree listing: https://gist.github.com/e41acc1e5d5f2db9d8498cf5a989eb7f