The version 3.0 of the couchbase extension breaks compatibility (as expected for a major bump) excluding on objects we are using in the Cache Component.

version 2.6 => https://docs.couchbase.com/php-sdk/2.6/managing-connections.html
version 3.0 => https://docs.couchbase.com/php-sdk/current/howtos/managing-connections.html

The symfony/cache's adapter is not compatible with version 3.0

/cc @ajcerezo