armadillo: 8.500.0 -> 8.500.1 (#40700)

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

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

These checks were done:

- built on NixOS

- 0 of 0 passed binary check by having a zero exit code.
- 0 of 0 passed binary check by having the new version present in output.
- found 8.500.1 with grep in /nix/store/fgj0bi559rzmrmzm0y0fyfr75wljlwzz-armadillo-8.500.1
- directory tree listing: https://gist.github.com/6b042c178fafc84e571bb6d2ed67ae65
- du listing: https://gist.github.com/32fd420f41d621a7b6b540cabbcf3f53