fix(botbase): use str.join because windows

WINDOWS PATHS, WINDOWS PATHS, WINDOWS PATHS.
This is not the stupidest thing ever.

Author: ooliver1

botbase/botbase.py

@@ -273,7 +273,7 @@ def run(self, *args, **kwargs) -> None:
             if "extras" in ext.parts or any(part.startswith("_") for part in ext.parts):
                 continue
             if ext.suffix == ".py":
-                a = str(ext).replace("/", ".")[:-3]
+                a = ".".join(ext.parts).removesuffix(".py")
                 log.info("Loading ext %s", a)
                 self.load_extension(a)
                 log.info("Loaded ext %s", a)