fix: environment variable member changed

app.py

@@ -29,8 +29,8 @@ def load_models():
 
 @st.cache_resource
 def load_client():
-  client = MilvusClient(user='resrer', password=os.env['MILVUS_PW'],
-                        uri=f"http://{os.env['MILVUS_HOST']}:19530", db_name='psgs_w100')
+  client = MilvusClient(user='resrer', password=os.environ['MILVUS_PW'],
+                        uri=f"http://{os.environ['MILVUS_HOST']}:19530", db_name='psgs_w100')
   return client