Update sbt-pgp to 2.3.1 (#378)

Author: Atry

build.sbt

@@ -45,7 +45,7 @@ addSbtPlugin("org.xerial.sbt" % "sbt-sonatype" % "3.9.21")
 
 addSbtPlugin("com.github.sbt" % "sbt-dynver" % "5.0.1")
 
-addSbtPlugin("com.github.sbt" % "sbt-pgp" % "2.2.1")
+addSbtPlugin("com.github.sbt" % "sbt-pgp" % "2.3.1")
 
 addSbtPlugin("org.lyranthe.sbt" % "partial-unification" % "1.1.2")