Bump grunt from 1.4.0 to 1.5.2

Bumps [grunt](https://github.com/gruntjs/grunt) from 1.4.0 to 1.5.2.
- [Release notes](https://github.com/gruntjs/grunt/releases)
- [Changelog](https://github.com/gruntjs/grunt/blob/main/CHANGELOG)
- [Commits](gruntjs/grunt@v1.4.0...v1.5.2)

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

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

Author: dependabot[bot]

package-lock.json

@@ -22,7 +22,7 @@
     "test": "grunt"
   },
   "dependencies": {
-    "grunt": "^1.4.0",
+    "grunt": "^1.5.2",
     "grunt-contrib-connect": "^3.0.0",
     "grunt-contrib-cssmin": "^4.0.0",
     "grunt-contrib-uglify": "^5.0.1",