praat: 6.0.37 -> 6.0.38

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

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

These checks were done:

- built on NixOS
- ran `/nix/store/ip7a4lqz98n8dx635131vi3pijyv3kci-praat-6.0.38/bin/praat --help` got 0 exit code
- ran `/nix/store/ip7a4lqz98n8dx635131vi3pijyv3kci-praat-6.0.38/bin/praat --version` and found version 6.0.38
- found 6.0.38 with grep in /nix/store/ip7a4lqz98n8dx635131vi3pijyv3kci-praat-6.0.38
- directory tree listing: https://gist.github.com/3cbb0648e4b084a658f6dd5b7c8ed3a4