Bump grunt from 1.4.1 to 1.5.3

Bumps [grunt](https://github.com/gruntjs/grunt) from 1.4.1 to 1.5.3.
- [Release notes](https://github.com/gruntjs/grunt/releases)
- [Changelog](https://github.com/gruntjs/grunt/blob/main/CHANGELOG)
- [Commits](gruntjs/grunt@v1.4.1...v1.5.3)

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

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

Author: dependabot[bot]

package-lock.json

@@ -4,7 +4,7 @@
   "main": "Gruntfile.js",
   "author": "Brainstorm Force",
   "devDependencies": {
-    "grunt": "^1.4.1",
+    "grunt": "^1.5.3",
     "grunt-wp-i18n": "^1.0.3",
     "grunt-wp-readme-to-markdown": "~2.0.1",
     "js-yaml": ">=3.13.1",