slugbuilder: Bump buildpacks

cloudfoundry/staticfile-buildpack@46a63b5...5a588b6
heroku/heroku-buildpack-ruby@c242c12...49af4ac
heroku/heroku-buildpack-nodejs@da19bdb...6c52af1
heroku/heroku-buildpack-clojure@53a17ee...628591b
heroku/heroku-buildpack-python@4293ec5...009d0dd
heroku/heroku-buildpack-java@317a467...58604da
heroku/heroku-buildpack-gradle@034eaeb...3e3baaa
heroku/heroku-buildpack-scala@c64e8c6...3b77716
heroku/heroku-buildpack-php@727aa85...8288ddb
heroku/heroku-buildpack-go@c17053c...213d029

Signed-off-by: Jonathan Rudenberg <jonathan@titanous.com>

slugbuilder/builder/buildpacks.txt

@@ -1,12 +1,12 @@
 https://github.com/heroku/heroku-buildpack-multi.git#ed950773
-https://github.com/cloudfoundry/staticfile-buildpack.git#46a63b58
-https://github.com/heroku/heroku-buildpack-ruby.git#c242c120
-https://github.com/heroku/heroku-buildpack-nodejs.git#da19bdb7
-https://github.com/heroku/heroku-buildpack-clojure.git#53a17ee5
-https://github.com/heroku/heroku-buildpack-python.git#4293ec55
-https://github.com/heroku/heroku-buildpack-java.git#317a4671
-https://github.com/heroku/heroku-buildpack-gradle.git#034eaeb9
-https://github.com/heroku/heroku-buildpack-scala.git#c64e8c6f
+https://github.com/cloudfoundry/staticfile-buildpack.git#5a588b6e
+https://github.com/heroku/heroku-buildpack-ruby.git#49af4ace
+https://github.com/heroku/heroku-buildpack-nodejs.git#6c52af1e
+https://github.com/heroku/heroku-buildpack-clojure.git#628591ba
+https://github.com/heroku/heroku-buildpack-python.git#009d0ddb
+https://github.com/heroku/heroku-buildpack-java.git#58604da1
+https://github.com/heroku/heroku-buildpack-gradle.git#3e3baaa3
+https://github.com/heroku/heroku-buildpack-scala.git#3b777167
 https://github.com/heroku/heroku-buildpack-play.git#cc5e6166
-https://github.com/heroku/heroku-buildpack-php.git#727aa850
-https://github.com/heroku/heroku-buildpack-go.git#c17053c6
+https://github.com/heroku/heroku-buildpack-php.git#8288ddb4
+https://github.com/heroku/heroku-buildpack-go.git#213d0298