Fix to deal with StrEnum in python 3.8

We can remove this once we stop supporting 3.8

Author: Val Brodsky

labelbox/schema/id_type.py

@@ -1,7 +1,18 @@
-from strenum import StrEnum
+import sys
 
+if sys.version_info > (3, 8):
+    from strenum import StrEnum
 
-class IdType(StrEnum):
+    class BaseStrEnum(StrEnum):
+        pass
+else:
+    from enum import Enum
+
+    class BaseStrEnum(str, Enum):
+        pass
+
+
+class IdType(BaseStrEnum):
     """
     The type of id used to identify a data row.