Deis Slugbuilder v2.4.2

v2.4.1 -> v2.4.2

Refactors

• 24e0ce9 Dockerfile: simplify chown commands

Fixes

• 37c5109 build.sh: switch to build_root before running hooks

Maintenance

• 0ff387f buildpacks: update heroku-buildpack-go to v48
• 4eada8d buildpacks: update heroku-buildpack-php to v110
• fcb645b buildpacks: update heroku-buildpack-python to v82
• 69abae5 buildpacks: update heroku-buildpack-gradle to v18
• d6445a6 buildpacks: update heroku-buildpack-java to v46
• 30ce52f buildpacks: update heroku-buildpack-go to v49
• 7e4e9cc buildpacks: update heroku-buildpack-php to v112