latte-dock: 0.7.3 -> 0.7.4 (#37030)

Semi-automatic update generated by https://github.com/ryantm/nix-update tools. These checks were done:

- built on NixOS
- Warning: no binary found that responded to help or version flags. (This warning appears even if the package isn't expected to have binaries.)
- found 0.7.4 with grep in /nix/store/n1ad51hdp3jagm7fx91gp3i580ghid4q-latte-dock-0.7.4
- found 0.7.4 in filename of file in /nix/store/n1ad51hdp3jagm7fx91gp3i580ghid4q-latte-dock-0.7.4