Update Google Cloud SQL guide

Closes quarkusio#43876

docs/src/main/asciidoc/deploying-to-google-cloud.adoc

@@ -291,13 +291,20 @@ WARNING: This only works when your application is running inside a Google Cloud
 
 === Using Cloud SQL with native executables
 
-When generating native executables, you must also mark `jnr.ffi.provider.jffi.NativeFinalizer$SingletonHolder` as runtime initialized.
+When generating native executables, you must mark `jnr.ffi.provider.jffi.NativeFinalizer$SingletonHolder` as runtime initialized.
 
 [source,properties]
 ----
 quarkus.native.additional-build-args=--initialize-at-run-time=jnr.ffi.provider.jffi.NativeFinalizer$SingletonHolder
 ----
 
+Additionally, starting with `com.google.cloud.sql:postgres-socket-factory:1.17.0`, you must also mark `com.kenai.jffi.internal.Cleaner` as runtime initialized.
+
+[source,properties]
+----
+quarkus.native.additional-build-args=--initialize-at-run-time=jnr.ffi.provider.jffi.NativeFinalizer$SingletonHolder\\,com.kenai.jffi.internal.Cleaner
+----
+
 == Going further
 
 You can find a set of extensions to access various Google Cloud Services in the Quarkiverse (a GitHub organization for Quarkus extensions maintained by the community),