makeself: 2.3.1 -> 2.4.0

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

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

These checks were done:

- built on NixOS
- ran ‘/nix/store/5j88qgnbbry87m8164s0a9agvz92z36q-makeself-2.4.0/bin/makeself -v’ and found version 2.4.0
- ran ‘/nix/store/5j88qgnbbry87m8164s0a9agvz92z36q-makeself-2.4.0/bin/makeself --version’ and found version 2.4.0
- found 2.4.0 with grep in /nix/store/5j88qgnbbry87m8164s0a9agvz92z36q-makeself-2.4.0
- directory tree listing: https://gist.github.com/5a4661783df3d9d6558c8f6670385b79