Bump grunt from 1.4.0 to 1.5.3

Bumps [grunt](https://github.com/gruntjs/grunt) from 1.4.0 to 1.5.3.
- [Release notes](https://github.com/gruntjs/grunt/releases)
- [Changelog](https://github.com/gruntjs/grunt/blob/main/CHANGELOG)
- [Commits](gruntjs/grunt@v1.4.0...v1.5.3)

---
updated-dependencies:
- dependency-name: grunt
  dependency-type: direct:development
...

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

package.json

@@ -13,7 +13,7 @@
     "node": ">= 0.10.0"
   },
   "devDependencies": {
-    "grunt": "1.4.0",
+    "grunt": "1.5.3",
     "grunt-contrib-clean": "2.0.0",
     "grunt-contrib-imagemin": "4.0.0",
     "grunt-contrib-jshint": "3.0.0",