[Security] Bump mime from 1.2.11 to 2.4.6

Bumps [mime](https://github.com/broofa/mime) from 1.2.11 to 2.4.6. **This update includes a security fix.**
- [Release notes](https://github.com/broofa/mime/releases)
- [Changelog](https://github.com/broofa/mime/blob/master/CHANGELOG.md)
- [Commits](https://github.com/broofa/mime/commits)

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

package.json

@@ -39,7 +39,7 @@
     "fs-extra": ">= 0.0.4",
     "jsmin": "^1.0.1",
     "less": "1.3.x",
-    "mime": "1.2.x",
+    "mime": "2.4.x",
     "opn": "^5.1.0",
     "qunit": "0.4.x",
     "seq": "0.3.x"