Update sbt-pgp to 2.2.1

Author: scala-steward

project/plugins.sbt

@@ -1,7 +1,7 @@
 libraryDependencies +=  "org.scala-js" %% "scalajs-env-jsdom-nodejs" % "1.1.0"
 
 addSbtPlugin("ch.epfl.scala"  % "sbt-scalafix"       % "0.9.33")
-addSbtPlugin("com.github.sbt" % "sbt-pgp"            % "2.1.2")
+addSbtPlugin("com.github.sbt" % "sbt-pgp"            % "2.2.1")
 addSbtPlugin("com.github.sbt" % "sbt-release"        % "1.1.0")
 addSbtPlugin("org.scala-js"   % "sbt-jsdependencies" % "1.0.2")
 addSbtPlugin("org.scala-js"   % "sbt-scalajs"        % "1.7.1")