The 21.0 release of SQL DB is a backward incompatible release.
This update requires upgrading the minimum Terraform version 1.3. Minimum provider version for private_service_access sub-module is 5.38
Removed settings.ip_configuration.require_ssl from all the modules (google_sql_database_instance) in favor of settings.ip_configuration.ssl_mode. This field is not available in provider version 6+