Merge pull request #1067 from scala-steward/update/sbt-version-policy-2.1.3

Update sbt-version-policy from 2.1.0 to 2.1.3

Author: mergify[bot]

project/plugins.sbt

@@ -5,4 +5,4 @@ addSbtPlugin("com.github.sbt" % "sbt-ci-release" % "1.5.10")
 addSbtPlugin("com.47deg" % "sbt-microsites" % "1.3.4")
 addSbtPlugin("com.github.sbt" % "sbt-unidoc" % "0.5.0")
 addSbtPlugin("com.thoughtworks.sbt-api-mappings" % "sbt-api-mappings" % "3.0.2")
-addSbtPlugin("ch.epfl.scala" % "sbt-version-policy" % "2.1.0")
+addSbtPlugin("ch.epfl.scala" % "sbt-version-policy" % "2.1.3")