Update build inputs to include git

This is required for determining the build hash rendered on the splash screen.

default.nix

@@ -11,7 +11,7 @@
     buildInputs = with pkgs; [ git xorg.libxcb openssl zlib ];
 
     # Packages needed during the build
-    nativeBuildInputs = with pkgs; [ python311 ];
+    nativeBuildInputs = with pkgs; [ git python311 ];
 
     # Amp creates files and directories in $HOME/.config/amp when run.
     # Since the checkPhase of the build process runs the test suite, we