chore(buildpacks): update heroku-buildpack-clojure to v77

See heroku/heroku-buildpack-clojure@v76...77

Author: mboersma

rootfs/builder/install-buildpacks

@@ -29,7 +29,7 @@ download_buildpack() {
 mkdir -p $BUILDPACK_INSTALL_PATH
 
 download_buildpack https://github.com/heroku/heroku-buildpack-multi.git          v1.0.0   01-multi
-download_buildpack https://github.com/heroku/heroku-buildpack-clojure.git        v76      02-clojure
+download_buildpack https://github.com/heroku/heroku-buildpack-clojure.git        v77      02-clojure
 download_buildpack https://github.com/heroku/heroku-buildpack-go.git             v70      03-go
 download_buildpack https://github.com/heroku/heroku-buildpack-gradle.git         v22      04-gradle
 download_buildpack https://github.com/heroku/heroku-buildpack-grails.git         v21      05-grails