Fix for Windows

Change-Id: I1f332e81cc8a67391c3a9133e37c9a8bb1362745

Author: bourke

mako/testing/_config.py

@@ -50,7 +50,7 @@ def _parse_cfg_file(filespec: Union[Path, str]):
     except FileNotFoundError as e:
         raise MissingConfig(f"No config file found at {filespec}") from e
     else:
-        with open(filepath) as f:
+        with open(filepath, encoding="utf-8") as f:
             cfg.read_file(f)
         return cfg