Build: 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)

Closes gh-226

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

package-lock.json

@@ -21,7 +21,7 @@
   ],
   "dependencies": {
     "async": "3.2.2",
-    "grunt": "1.4.0",
+    "grunt": "1.5.2",
     "grunt-cli": "1.4.2",
     "grunt-jquery-content": "3.1.0"
   }