pinegrow: don't auto update
pinegrow: don't auto update

there is an old version of pinegrow (6.21) on
https://repology.org which didn't follow semantic
versioning.

Signed-off-by: Florian Brandes <72a4ed90054144e1cced48b52d8b9e553c1a72e8@posteo.de>

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