chore(buildpacks): update heroku-buildpack-scala to v72

See heroku/heroku-buildpack-scala@v71...v72

Author: mboersma

rootfs/builder/install-buildpacks

@@ -38,5 +38,5 @@ download_buildpack https://github.com/heroku/heroku-buildpack-play.git
 download_buildpack https://github.com/heroku/heroku-buildpack-python.git         v81
 download_buildpack https://github.com/heroku/heroku-buildpack-php.git            v108
 download_buildpack https://github.com/heroku/heroku-buildpack-clojure.git        v75
-download_buildpack https://github.com/heroku/heroku-buildpack-scala.git          v71
+download_buildpack https://github.com/heroku/heroku-buildpack-scala.git          v72
 download_buildpack https://github.com/heroku/heroku-buildpack-go.git             v44