Update sbt-sourcegraph to 0.4.3 (#647)

Author: keynmol

project/plugins.sbt

@@ -6,7 +6,7 @@ addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.4.6")
 addSbtPlugin("org.scalameta" % "sbt-mdoc" % "2.2.24")
 addSbtPlugin("ch.epfl.scala" % "sbt-scalafix" % "0.10.1")
 addSbtPlugin("com.thesamet" % "sbt-protoc" % "1.0.6")
-addSbtPlugin("com.sourcegraph" % "sbt-sourcegraph" % "0.4.2")
+addSbtPlugin("com.sourcegraph" % "sbt-sourcegraph" % "0.4.3")
 addSbtPlugin("com.lightbend.sbt" % "sbt-java-formatter" % "0.6.1")
 addSbtPlugin("pl.project13.scala" % "sbt-jmh" % "0.4.3")
 addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "0.15.0")