picard-tools: 2.18.7 -> 2.18.9 (#42967)

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

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

These checks were done:

- built on NixOS
- Warning: no invocation of /nix/store/ah3v1x61gmj9lan8a3qvy3824lqvjdgi-picard-tools-2.18.9/bin/picard 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 2.18.9 with grep in /nix/store/ah3v1x61gmj9lan8a3qvy3824lqvjdgi-picard-tools-2.18.9
- directory tree listing: https://gist.github.com/0972acdc51fe8a1cde470e4ab5e87993
- du listing: https://gist.github.com/6a66b6723ce4887cd108678369b87360