mark scala-finch generator as deprecated #30

Job	Run time
Build sbt/Scala (samples/server/petstore/scala-cask)	1m 19s
Build sbt/Scala (samples/server/petstore/scalatra)	3m 46s
Build sbt/Scala (samples/server/petstore/scala-pekko-http-server)	54s
Build sbt/Scala (samples/server/petstore/scala-play-server)	5m 31s
Build sbt/Scala (samples/server/petstore/scala-akka-http-server)	57s
Build sbt/Scala (samples/server/petstore/scala-http4s-server)	57s
	13m 24s

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