Upgrade alpine, java, kafka, circe and grafter versions #51
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Relates to #50
Trying to resolve a number of vulnerabilities that have been highlighted.
2.3.1
to resolve issues with jackson databind2.6.1
to resolve some issues with guava2.3.1
isn't the latest version of kafka but any higher and we can no longer use cakesolutions/scala-kafka-client (used in the tests) which doesn't look like it is maintained anymore. Planning on creating a separate issue to look at removing this completely but wanted to keep this PR quite small whilst still resolving the majority of issues.Grafter is also no longer maintained so also planning on creating an issue to look at removing (but again, this update should resolve the main issue with guava I think).