Merge 'flake.nix: add uv dependency to nativeBuildInputs' from Ceferino Patino

`make test` fails when using the nix-shell environment due to `uv` not
being included in the list of dependencies with
`make: uv: No such file or directory
make: *** [Makefile:55: uv-sync-test] Error 127`
simple fix adding it to `nativeBuildInputs` of the shell. after that
runs as expected.

Reviewed-by: Levy A. (@levydsa)

Closes #2636

flake.nix

@@ -71,6 +71,7 @@
             python3
             nodejs
             toolchain
+            uv
           ] ++ lib.optionals pkgs.stdenv.isDarwin [
             apple-sdk
           ];