chore(deps): update samples-index_tuning_sample to v3.2.4 (#434)

Author: renovate-bot

samples/index_tuning_sample/requirements.txt

@@ -1,3 +1,3 @@
 langchain-community==0.4.2
 langchain-google-cloud-sql-pg==0.15.0
-langchain-google-vertexai==3.2.3
+langchain-google-vertexai==3.2.4