chore(deps): update dependency langchain-community to v0.4 (#361)

Author: renovate-bot

samples/index_tuning_sample/requirements.txt

@@ -1,3 +1,3 @@
-langchain-community==0.3.31
+langchain-community==0.4
 langchain-google-cloud-sql-pg==0.14.1
 langchain-google-vertexai==2.1.2