Upgrade sbt-docker from 1.9.0 to 1.11.0

Fixes Docker CLI test CI failure caused by newer Docker Engine / BuildKit
no longer printing 'Successfully built <id>', which sbt-docker's regex
couldn't parse (DockerBuildException: Could not parse Docker image id).

Author: jupblb

project/plugins.sbt

@@ -1,5 +1,5 @@
 addSbtPlugin("org.xerial.sbt" % "sbt-pack" % "0.14")
-addSbtPlugin("se.marcuslonnberg" % "sbt-docker" % "1.9.0")
+addSbtPlugin("se.marcuslonnberg" % "sbt-docker" % "1.11.0")
 addSbtPlugin("com.github.sbt" % "sbt-ci-release" % "1.11.1")
 addSbtPlugin("com.eed3si9n" % "sbt-buildinfo" % "0.10.0")
 addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.5.5")