chore(deps): bump tmp from 0.2.1 to 0.2.4 in /tests/apps/multi

Bumps [tmp](https://github.com/raszi/node-tmp) from 0.2.1 to 0.2.4.
- [Changelog](https://github.com/raszi/node-tmp/blob/master/CHANGELOG.md)
- [Commits](https://github.com/raszi/node-tmp/compare/v0.2.1...v0.2.4)

---
updated-dependencies:
- dependency-name: tmp
  dependency-version: 0.2.4
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

tests/apps/multi/package.json

@@ -6,7 +6,7 @@
     "grunt-cli": "~1.4.3",
     "grunt-contrib-compass": "~1.1.1",
     "load-grunt-tasks": "~5.1.0",
-    "tmp": "0.2.1"
+    "tmp": "0.2.4"
   },
   "description": "Test application for heroku multi buildpack.",
   "engines": {