treewide: update to webkitgtk_4_1 where possible

Methodology:
- `sed` to find and replace in pkgs/*
- exclude pkgs/top-level
- nixpkgs-review on x86_64-linux and aarch64-linux
- revert everything that doesn't build
- revert everything that doesn't launch [x86_64-linux]
- check upstream source whether the change makes sense [free software only]

pkgs/development/lisp-modules/ql.nix

@@ -75,7 +75,7 @@ let
         nativeLibs = [ pkgs.sqlite ];
       });
       cl-webkit2 = super.cl-webkit2.overrideLispAttrs (o: {
-        nativeLibs = [ pkgs.webkitgtk_4_0 ];
+        nativeLibs = [ pkgs.webkitgtk_4_1 ];
       });
       dbd-mysql = super.dbd-mysql.overrideLispAttrs (o: {
         nativeLibs = [ pkgs.mariadb.client ];