Update Ruff and enable F821 in stubs (#11771)

stubs/hdbcli/hdbcli/dbapi.pyi

@@ -11,7 +11,6 @@ from .resultrow import ResultRow
 apilevel: str
 threadsafety: int
 paramstyle: tuple[str, ...]  # hdbcli defines it as a tuple which does not follow PEP 249
-connect = Connection
 
 class Connection:
     def __init__(
@@ -40,6 +39,8 @@ class Connection:
     def setautocommit(self, auto: bool = ...) -> None: ...
     def setclientinfo(self, key: str, value: str | None = ...) -> None: ...
 
+connect = Connection
+
 class LOB:
     def __init__(self, *args: Any, **kwargs: Any) -> None: ...
     def close(self) -> bool: ...