Update sbt-wartremover to 3.1.7

Author: scala-steward

project/plugins.sbt

@@ -8,4 +8,4 @@ addSbtPlugin("net.vonbuchholtz"          % "sbt-dependency-check"      % "3.1.1"
 addSbtPlugin("org.scalameta"             % "sbt-mdoc"                  % "2.2.18")
 addSbtPlugin("org.scalameta"             % "sbt-scalafmt"              % "2.4.2")
 addSbtPlugin("org.scalastyle"           %% "scalastyle-sbt-plugin"     % "1.0.0")
-addSbtPlugin("org.wartremover"           % "sbt-wartremover"           % "2.4.13")
+addSbtPlugin("org.wartremover"           % "sbt-wartremover"           % "3.1.7")