sysutils/graylog: update to 4.0.5

ChangeLog: https://docs.graylog.org/en/4.0/pages/changelog.html#graylog-4-0-5

• Prevent NullPointerException in index optimization job https://github.com/Graylog2/graylog2-server/pull/10119
• Various ES7 backend indexing fixes

Reported by: portscout
Sponsored by: SkunkWerks, GmbH