Update sbt-sonatype to 3.9.20 (#165)

Author: scala-steward

project/plugins.sbt

@@ -1,6 +1,6 @@
 addSbtPlugin("com.thoughtworks.sbt-best-practice" % "sbt-best-practice" % "8.2.5")
 
-addSbtPlugin("org.xerial.sbt" % "sbt-sonatype" % "3.9.17")
+addSbtPlugin("org.xerial.sbt" % "sbt-sonatype" % "3.9.20")
 
 addSbtPlugin("com.dwijnand" % "sbt-dynver" % "4.1.1")