libtins: 3.5 -> 4.0 (#38208)

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

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

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 4.0 with grep in /nix/store/izz1bkj35g5bb6kvqa5kqgb376xhardg-libtins-4.0
- found 4.0 in filename of file in /nix/store/izz1bkj35g5bb6kvqa5kqgb376xhardg-libtins-4.0
- directory tree listing: https://gist.github.com/26990576c9472ca38b4d21613157856b