python3Packages.nbsphinx: fix build

upstream has already relaxed the dependency on sphinx (8.2.0 and 8.2.1 were _actually_ broken) but not released this yet. revert with next update

pkgs/development/python-modules/nbsphinx/default.nix

@@ -1,6 +1,7 @@
 {
   lib,
   buildPythonPackage,
+  fetchpatch,
   fetchPypi,
   setuptools,
   docutils,
@@ -23,6 +24,12 @@ buildPythonPackage rec {
     inherit pname version;
     hash = "sha256-q9KYpobVX6iU72l8UdRPJOU6oxLa2uOOgpIPJQpUVv4=";
   };
+  patches = [
+    (fetchpatch {
+      url = "https://github.com/spatialaudio/nbsphinx/commit/a921973a5d8ecc39c6e02184572b79ab72c9978c.patch";
+      hash = "sha256-uxfSaOESWn8uVcUm+1ADzQgMQDEqaTs0TbfNYsS+E6I=";
+    })
+  ];
 
   build-system = [ setuptools ];