Update sbt-site-paradox to 1.6.0 (#938)

* Update sbt-site-paradox to 1.6.0

* Add dependency override for scala-xml

---------

Co-authored-by: Michel Davit <micheld@spotify.com>

project/plugins.sbt

@@ -1,5 +1,5 @@
 addSbtPlugin("com.github.sbt" % "sbt-ghpages" % "0.8.0")
-addSbtPlugin("com.github.sbt" % "sbt-site-paradox" % "1.5.0")
+addSbtPlugin("com.github.sbt" % "sbt-site-paradox" % "1.6.0")
 addSbtPlugin("com.github.sbt" % "sbt-unidoc" % "0.5.0")
 addSbtPlugin("com.lightbend.paradox" % "sbt-paradox" % "0.10.6")
 addSbtPlugin("com.thesamet" % "sbt-protoc" % "1.0.7")
@@ -8,3 +8,8 @@ addSbtPlugin("org.scalameta" % "sbt-mdoc" % "2.5.2")
 addSbtPlugin("org.scoverage" % "sbt-scoverage" % "2.0.11")
 addSbtPlugin("org.typelevel" % "sbt-typelevel" % "0.6.7")
 addSbtPlugin("pl.project13.scala" % "sbt-jmh" % "0.4.7")
+
+// sbt-site plugin conflict. Remove after update
+dependencyOverrides ++= Seq(
+  "org.scala-lang.modules" %% "scala-xml" % "2.2.0"
+)