lmdb: 0.9.21 -> 0.9.22

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

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

These checks were done:

- built on NixOS
- ran `/nix/store/lycr0rb3lgdhnjfsl44wv9vw74gpsh44-lmdb-0.9.22-bin/bin/mdb_stat -V` and found version 0.9.22
- ran `/nix/store/lycr0rb3lgdhnjfsl44wv9vw74gpsh44-lmdb-0.9.22-bin/bin/mdb_copy -V` and found version 0.9.22
- ran `/nix/store/lycr0rb3lgdhnjfsl44wv9vw74gpsh44-lmdb-0.9.22-bin/bin/mdb_dump -V` and found version 0.9.22
- ran `/nix/store/lycr0rb3lgdhnjfsl44wv9vw74gpsh44-lmdb-0.9.22-bin/bin/mdb_load -V` and found version 0.9.22
- found 0.9.22 with grep in /nix/store/lycr0rb3lgdhnjfsl44wv9vw74gpsh44-lmdb-0.9.22-bin
- directory tree listing: https://gist.github.com/f4d443d41dd66aa5f5038de9319c607d