Update sbt-scoverage to 1.9.3

Author: scala-steward

project/plugins.sbt

@@ -3,4 +3,4 @@ addSbtPlugin("org.scalameta"  % "sbt-scalafmt"  % "2.4.6")
 addSbtPlugin("org.xerial.sbt" % "sbt-sonatype"  % "3.9.10")
 addSbtPlugin("com.github.sbt" % "sbt-release"   % "1.1.0")
 addSbtPlugin("com.github.sbt" % "sbt-pgp"       % "2.1.2")
-addSbtPlugin("org.scoverage"  % "sbt-scoverage" % "1.9.2")
+addSbtPlugin("org.scoverage"  % "sbt-scoverage" % "1.9.3")