python 3 updates

- Fix super() calls for python 3
- No need to inherit objects.
- No need for u at the start of strings
- Tidied up some brackets and f-strings too

web/pgadmin/misc/cloud/azure/azure_cache.py

@@ -15,7 +15,7 @@ if TYPE_CHECKING:
 _LOGGER = logging.getLogger(__name__)
 
 
-class TokenCachePersistenceOptions(object):
+class TokenCachePersistenceOptions():
     """Options for persistent token caching.
 
     Most credentials accept an instance of this class to configure persistent