Use patch-ng fork instead of unmaintained patch

Author: eclipseo

setup.cfg

@@ -82,7 +82,7 @@ full =
     typecode[full] >= 30.0.1
 
 patch =
-    patch >= 1.16
+    patch-ng >= 1.17
 
 testing =
     pytest >= 6, != 7.0.0

src/extractcode/patch.py

@@ -134,7 +134,7 @@ def patch_info(location):
 
     Raise an exception if the file is not a patch file or cannot be parsed.
     """
-    import patch as pythonpatch
+    import patch_ng as pythonpatch
     patchset = pythonpatch.fromfile(location)
     if not patchset:
         msg = 'Unable to parse patch file: %(location)s' % locals()