python3Packages.pikepdf: disable on older Python releases
python3Packages.pikepdf: disable on older Python releases

see https://github.com/pikepdf/pikepdf/blob/v5.1.1/setup.cfg#L43
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