[BUG]: fix auth (#1864)

## Description of changes

*Summarize the changes made by this PR.*
 - Improvements & Bug fixes
	 - Hosted auth is not working due to a missing import

chromadb/auth/fastapi.py

@@ -8,6 +8,7 @@
 from starlette.responses import Response
 from starlette.types import ASGIApp
 
+import chromadb
 from chromadb.config import DEFAULT_TENANT, System
 from chromadb.auth import (
     AuthorizationContext,