home: use git from nixpkgs-unstable

flake.nix

@@ -276,6 +276,9 @@
               inherit system;
             };
           })
+          (_final: _prev: {
+            pkgs-unstable = import nixpkgs-unstable {inherit system;};
+          })
         ];
       };
     in {

shared/home/default.nix

@@ -83,6 +83,7 @@
   ];
 
   programs.git = {
+    package = pkgs.pkgs-unstable.git;
     enable = true;
     userEmail = email;
     userName = "Motiejus Jakštys";