praat: 6.0.38 -> 6.0.40 (#40836)

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
- /nix/store/51k239kq3pb732lar9y4j996p8inmmzq-praat-6.0.40/bin/praat passed the binary check.
- 1 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 6.0.40 with grep in /nix/store/51k239kq3pb732lar9y4j996p8inmmzq-praat-6.0.40
- directory tree listing: https://gist.github.com/48461f433362d4c7c4143942011a22d6
- du listing: https://gist.github.com/621b0b6d55906c1ba560361af3d25bcb