add configparser.RawConfigParser.converters (#13146)

stdlib/@tests/stubtest_allowlists/common.txt

@@ -72,7 +72,6 @@ bz2.BZ2File.peek
 codecs.StreamReader.charbuffertype
 codecs.StreamReader.seek
 codecs.StreamWriter.seek
-configparser.RawConfigParser.converters
 ctypes.ARRAY
 ctypes.SetPointerType
 ctypes.c_voidp

stdlib/configparser.pyi

@@ -277,6 +277,8 @@ class RawConfigParser(_Parser):
     def remove_option(self, section: str, option: str) -> bool: ...
     def remove_section(self, section: str) -> bool: ...
     def optionxform(self, optionstr: str) -> str: ...
+    @property
+    def converters(self) -> ConverterMapping: ...
 
 class ConfigParser(RawConfigParser):
     # This is incompatible with MutableMapping so we ignore the type