Fix source tag to use _ instead of -

Author: jennapederson

api/deps.py

@@ -1,7 +1,7 @@
 from pinecone import Pinecone
 from api.config import settings
 
-pc = Pinecone(api_key=settings.pinecone_api_key, source_tag="pinecone:fastapi-pinecone-async-example")
+pc = Pinecone(api_key=settings.pinecone_api_key, source_tag="pinecone:fastapi_pinecone_async_example")
 
 def get_pinecone_dense_index():
     return pc.IndexAsyncio(host=settings.pinecone_dense_index_host)