Update sbt-sonatype to 3.12.2 (#350)

Author: scala-steward

project/plugins.sbt

@@ -8,7 +8,7 @@ addSbtPlugin("org.scoverage" %% "sbt-coveralls" % "1.3.14")
 addSbtPlugin("com.github.sbt" % "sbt-release" % "1.4.0")
 
 // https://github.com/xerial/sbt-sonatype
-addSbtPlugin("org.xerial.sbt" % "sbt-sonatype" % "3.12.0")
+addSbtPlugin("org.xerial.sbt" % "sbt-sonatype" % "3.12.2")
 
 // https://github.com/sbt/sbt-pgp
 addSbtPlugin("com.github.sbt" % "sbt-pgp" % "2.3.0")