nixos/automysqlbackup: fix after mariadb 10.6 upgrade
nixos/automysqlbackup: fix after mariadb 10.6 upgrade

client tries to connect over TCP, which failes because this uses socket auth

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