explicitly hint v, to appease mypy mostly

Author: wyattscarpenter

mypy/config_parser.py

@@ -600,6 +600,7 @@ def parse_section(
                 else:
                     continue
             ct = type(dv)
+        v: None | bool | object | tuple[int, int] = None
         try:
             if ct is bool:
                 # ConfigParser has an equivalent (but poorly-stubbed) getboolean method,