Fix spelling error

Author: abravalheri

setuptools/_static.py

@@ -140,7 +140,7 @@ class Dict(dict, Static):
     _prevent_modification(Dict, _method, "`dict(value)`")
 
 
-class SpeficierSet(packaging.specifiers.SpecifierSet, Static):
+class SpecifierSet(packaging.specifiers.SpecifierSet, Static):
     """Not exactly a built-in type but useful for ``requires-python``"""
 
 

setuptools/config/setupcfg.py

@@ -657,7 +657,7 @@ def parsers(self):
             'packages': self._parse_packages,
             'entry_points': self._parse_file_in_root,
             'py_modules': parse_list,
-            'python_requires': _static.SpeficierSet,  # Core Metadata
+            'python_requires': _static.SpecifierSet,  # Core Metadata
             'cmdclass': parse_cmdclass,
         }