python313Packages.paypalhttp: fix http header case issue

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

···
   lib,
   buildPythonPackage,
   fetchFromGitHub,
+  fetchpatch2,
 
   # propagates
   pyopenssl,
···
     tag = version;
     hash = "sha256-3ihcpYtpcejPkiyf4g4jveyNU6flQB2sv9EZ5Pd7tUc=";
   };
+
+  patches = [
+    (fetchpatch2 {
+      # fix content-type header case sensitiyivy
+      url = "https://github.com/paypal/paypalhttp_python/commit/72609783230663b8e34c6f0384837db7b166c8f4.patch";
+      hash = "sha256-K2hO3XRrJ+Gm+rLtWRPy0E2syLS4RhNNHIA3w4xVYtY=";
+    })
+  ];
 
   postPatch = ''
     substituteInPlace tests/http_response_test.py \