pcsx2: disable auto updates
pcsx2: disable auto updates

An update is triggered every time a new release is made which,
unfortunately for PCSX2's release model, is every time a PR is merged.
This is way too high frequency so let's disable this.

NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs