Update scala-compiler, scala-library to 2.13.18 #84

Job	Run time
build (2.11.12, --addPluginSbtFile=project/plugins.sbt.scala-js.1.x)	6s
build (2.12.11, --addPluginSbtFile=project/plugins.sbt.scala-js.1.x)	5s
build (2.13.18, --addPluginSbtFile=project/plugins.sbt.scala-js.1.x)	8s
build (2.12.11)	8s
build (2.10.7)	5s
build (2.11.12)	7s
build (2.13.18)	8s
	47s

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