manga-ocr: relax 'numpy<2' constraint (#369936)

Fixes the build failure in #369935

I'll also create an upstream PR for the same.

As best I can tell, relaxing this constraint gives us a perfectly
working package. I've verified the application launches, and basic OCR
functionality works.

pkgs/development/python-modules/manga-ocr/default.nix

@@ -37,6 +37,11 @@ buildPythonPackage rec {
     unidic-lite
   ];
 
+  postPatch = ''
+    substituteInPlace pyproject.toml \
+      --replace-fail "numpy<2" "numpy"
+  '';
+
   meta = with lib; {
     description = "Optical character recognition for Japanese text, with the main focus being Japanese manga";
     homepage = "https://github.com/kha-white/manga-ocr";