feh: 2.26.4 -> 2.27 (#43007)

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

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

These checks were done:

- built on NixOS
- /nix/store/nwnygmha0i26zszsz6vjk4f4kyjx7qxq-feh-2.27/bin/feh passed the binary check.
- /nix/store/nwnygmha0i26zszsz6vjk4f4kyjx7qxq-feh-2.27/bin/.feh-wrapped passed the binary check.
- 2 of 2 passed binary check by having a zero exit code.
- 0 of 2 passed binary check by having the new version present in output.
- found 2.27 with grep in /nix/store/nwnygmha0i26zszsz6vjk4f4kyjx7qxq-feh-2.27
- directory tree listing: https://gist.github.com/e18bcf94ab62852f0967389e4d102bd7
- du listing: https://gist.github.com/c252a1ef6aa364f8139ab9a63911130a