Disable scala steward action (ocadotechnology#124)

disable scala steward action

Update aws-java-sdk-core to 1.12.256 (ocadotechnology#55)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Update aws-java-sdk-core to 1.12.249 (ocadotechnology#48)

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drop irrelevant comment

remove version.sbt