Bump grunt from 1.4.1 to 1.5.3 in /atramhasis/static/admin

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>

atramhasis/static/admin/package.json

@@ -16,7 +16,7 @@
 		"foundation-sites": "~5.5.0"
 	},
 	"devDependencies": {
-		"grunt": "^1.4.1",
+		"grunt": "^1.5.3",
 		"grunt-contrib-clean": "^1.1.0",
 		"grunt-contrib-copy": "^0.8.2",
 		"grunt-dojo": "^1.1.2",