Update sbt-pgp to 2.2.1 (#698)

* Update sbt-pgp to 2.2.1

* Revert commit(s) bae49c7

* Update sbt-pgp to 2.2.1

---------

Co-authored-by: Taro L. Saito <leo@xerial.org>

Author: scala-steward

project/plugins.sbt

@@ -1,5 +1,5 @@
 addSbtPlugin("org.xerial.sbt" % "sbt-sonatype" % "3.9.17")
-addSbtPlugin("com.github.sbt" % "sbt-pgp"      % "2.2.0")
+addSbtPlugin("com.github.sbt" % "sbt-pgp"      % "2.2.1")
 // TODO: Fixes jacoco error:
 // java.lang.NoClassDefFoundError: Could not initialize class org.jacoco.core.internal.flow.ClassProbesAdapter
 //addSbtPlugin("com.github.sbt"   % "sbt-jacoco"      % "3.3.0")