CORE-69: update sbt, scala-sbt image, scoverage

[davidangb]

Ticket: https://broadworkbench.atlassian.net/browse/CORE-117

Update sbt, scala-sbt docker image, and scoverage plugin.

Consolidates #1581 and #1572, and #1587. Though … #1587 and #1581 seem incorrect anyway

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PR checklist

• I've followed the instructions if I've made any changes to the API, especially if they're breaking changes
• I've filled out the Security Risk Assessment (requires Broad Internal network access) and attached the result to the JIRA ticket

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud