Update sbt-projectmatrix to 0.11.0 in 0.11.x (#1903)

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

Author: scala-steward

project/plugins.sbt

@@ -22,7 +22,7 @@ addSbtPlugin("com.github.sbt" % "sbt-ci-release" % "1.9.3")
 
 addSbtPlugin("com.thesamet" % "sbt-protoc-gen-project" % "0.1.8")
 
-addSbtPlugin("com.eed3si9n" % "sbt-projectmatrix" % "0.10.1")
+addSbtPlugin("com.eed3si9n" % "sbt-projectmatrix" % "0.11.0")
 
 addSbtPlugin("org.scalameta" % "sbt-mdoc" % "2.5.4")