fix creds authentication

Author: activesoull

deeplake/core/storage/azure.py

@@ -104,6 +104,7 @@ def __getitem__(self, path):
 
     def __delitem__(self, path):
         self.check_readonly()
+        self._check_update_creds()
         blob_client = self.container_client.get_blob_client(
             f"{self.root_folder}/{path}"
         )
@@ -364,7 +365,8 @@ def _check_update_creds(self, force=False):
         from azure.core.credentials import AzureSasCredential  # type: ignore
 
         if self.expiration and (
-            force or float(self.expiration) < datetime.now(timezone.utc).timestamp()
+            force
+            or float(self.expiration) - datetime.now(timezone.utc).timestamp() < 300
         ):
             client = DeepLakeBackendClient(self.token)
             org_id, ds_name = self.tag.split("/")