Update sbt-github-actions to 0.29.0

Author: scala-steward

project/plugins.sbt

@@ -11,4 +11,4 @@ addSbtPlugin("com.github.sbt" % "sbt-less" % "2.0.1")
 addSbtPlugin("com.github.sbt" % "sbt-native-packager" % "1.11.4")
 addSbtPlugin("com.github.sbt" % "sbt-ci-release" % "1.11.2")
 addSbtPlugin("pl.project13.scala" % "sbt-jmh" % "0.4.8")
-addSbtPlugin("com.github.sbt" % "sbt-github-actions" % "0.28.0")
+addSbtPlugin("com.github.sbt" % "sbt-github-actions" % "0.29.0")