python38Packages.shapely: fix failing test

The test_svg fails on checkPhase so the package can't be build.

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

@@ -1,4 +1,4 @@
-{ lib, stdenv, buildPythonPackage, fetchPypi, substituteAll, pythonOlder
+{ lib, stdenv, buildPythonPackage, fetchPypi, fetchpatch, substituteAll, pythonOlder
 , geos, pytest, cython
 , numpy
 }:
@@ -31,6 +31,11 @@ buildPythonPackage rec {
       libgeos_c = GEOS_LIBRARY_PATH;
       libc = lib.optionalString (!stdenv.isDarwin) "${stdenv.cc.libc}/lib/libc${stdenv.hostPlatform.extensions.sharedLibrary}.6";
     })
+   # included in next release.
+   (fetchpatch {
+     url = "https://github.com/Toblerity/Shapely/commit/ea5b05a0c87235d3d8f09930ad47c396a76c8b0c.patch";
+     sha256 = "sha256-egdydlV+tpXosSQwQFHaXaeBhXEHAs+mn7vLUDpvybA=";
+   })
  ];
 
   # Disable the tests that improperly try to use the built extensions