Logstash core jruby version update required for google-protobuf library update

[IngaFeick]

We would like to update the google-protobuf library to the latest java version 3.24.3. This version requires ruby >= 2.7. The earliest jruby supporting 2.7 ruby is 9.4 but our test setup has shown an issue with openssl in that. Also logstash itself is using only version 9.3. Therefore we cannot update the google-protobuf library to any version > 3.23 which is the last version not requiring a ruby update.