The FINAL revision of legacy version 4.0 is now available on the version 4.0 template’s 4.0[-light] branch and/or as the 4.0[-light] Docker image tag
IMPORTANT: FINAL means that the 3 years long term maintenance period of this legacy version is now ended. No further revisions will be released.
If you are still using this legacy version 4.0 you MUST consider upgrading to version 5 (currently 5.3.25) that will shortly enter its 3 years long term maintenance period.