Bump grunt from 1.5.2 to 1.5.3

Bumps [grunt](https://github.com/gruntjs/grunt) from 1.5.2 to 1.5.3.
- [Release notes](https://github.com/gruntjs/grunt/releases)
- [Changelog](https://github.com/gruntjs/grunt/blob/main/CHANGELOG)
- [Commits](gruntjs/grunt@v1.5.2...v1.5.3)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -16,7 +16,7 @@
   "devDependencies": {
     "bower": "^1.8.8",
     "eslint-config-webrtc": ">=1.0.0",
-    "grunt": "^1.5.2",
+    "grunt": "^1.5.3",
     "grunt-cli": "^1.3.2",
     "grunt-contrib-clean": "^2.0.0",
     "grunt-contrib-copy": ">=0.8.0",