efivar: 34 -> 35

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

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

These checks were done:

- built on NixOS
- ran ‘/nix/store/09zlj936d2jvjwdmj9c9f843fd86bcs3-efivar-35/bin/efivar -h’ got 0 exit code
- ran ‘/nix/store/09zlj936d2jvjwdmj9c9f843fd86bcs3-efivar-35/bin/efivar --help’ got 0 exit code
- ran ‘/nix/store/09zlj936d2jvjwdmj9c9f843fd86bcs3-efivar-35/bin/efivar help’ got 0 exit code
- found 35 with grep in /nix/store/09zlj936d2jvjwdmj9c9f843fd86bcs3-efivar-35
- directory tree listing: https://gist.github.com/6f811428a47ee181fc412ef78ff64450