README: sync package count with https://search.nixos.org/packages

The count was bump last month on the official nixos website:
> 8ae0465e9a
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Yohann Boniface 2025-04-17 01:14:46 +02:00 committed by GitHub
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</p>
[Nixpkgs](https://github.com/nixos/nixpkgs) is a collection of over
100,000 software packages that can be installed with the
120,000 software packages that can be installed with the
[Nix](https://nixos.org/nix/) package manager. It also implements
[NixOS](https://nixos.org/nixos/), a purely-functional Linux distribution.