chore: adhere to ruff's UP

basically use `list` and `type` instead of `List` and `Type`

this is save to use for python3.9 and has been deprecated. also has some
performance drawbacks.
read more here: https://docs.astral.sh/ruff/rules/non-pep585-annotation/

lnbits/commands.py

@@ -83,7 +83,7 @@ def get_super_user() -> Optional[str]:
             "Superuser id not found. Please check that the file "
             + f"'{superuser_file.absolute()}' exists and has read permissions."
         )
-    with open(superuser_file, "r") as file:
+    with open(superuser_file) as file:
         return file.readline()