git-secret: 0.2.3 -> 0.2.4

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

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

These checks were done:

- built on NixOS
- /nix/store/rhxzf1mc0jz2m3rp0rg5wqn81ykfshay-git-secret-0.2.4/bin/git-secret passed the binary check.
- /nix/store/rhxzf1mc0jz2m3rp0rg5wqn81ykfshay-git-secret-0.2.4/bin/.git-secret-wrapped passed the binary check.
- 2 of 2 passed binary check by having a zero exit code.
- 1 of 2 passed binary check by having the new version present in output.
- found 0.2.4 with grep in /nix/store/rhxzf1mc0jz2m3rp0rg5wqn81ykfshay-git-secret-0.2.4
- directory tree listing: https://gist.github.com/d460daac78bbcef226d1fff7918d150d
- du listing: https://gist.github.com/ea683543c922a9c179a97faf441a1797