chore: Update cloud-sql-proxy.md

Author: jackwotherspoon

docs/cmd/cloud-sql-proxy.md

@@ -221,7 +221,7 @@ Third Party Licenses
   To view all licenses for third party dependencies used within this
   distribution please see:
 
-  https://storage.googleapis.com/cloud-sql-connectors/cloud-sql-proxy/v2.15.1/third_party/licenses.tar.gz 
+  https://storage.googleapis.com/cloud-sql-connectors/cloud-sql-proxy/v2.15.2/third_party/licenses.tar.gz 
 
 
 ```