Fix Scala Steward by allowing building under Java 21 #22
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Scala Steward can't run on this repo until it allows building under Java 21, due to guardian/scala-steward-public-repos#67 ... we're now running our Scala Steward workflow with Java 21 LTS, which means that all projects that want to have Scala Steward updates (like this one) need to be able to build under Java 21 (even if the projects are still running in production on Java 8).
Being able to build with Java 21 requires using recent versions of Scala (2.12.18+) and sbt (1.9.0+) - for this repo, all that's needed is a bump of sbt version!
(unfortunately the Scala Steward run failing affects everyone, see guardian/scala-steward-public-repos#60 - so I've removed
mobile-logstash-encoder
from Scala Steward until this PR is merged)