entr: 4.0 -> 4.1

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

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

These checks were done:

- built on NixOS
- Warning: no invocation of /nix/store/10c98102g693y06k81q97z6akq0a87i8-entr-4.1/bin/entr 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 4.1 with grep in /nix/store/10c98102g693y06k81q97z6akq0a87i8-entr-4.1
- directory tree listing: https://gist.github.com/fd156bc7a5f670e3b90073b60678bee9
- du listing: https://gist.github.com/3a2e6fc964562e2a7d597aeb4c95b46d