chore(deps-dev): bump grunt from 1.4.1 to 1.5.2 in /website

Bumps [grunt](https://github.com/gruntjs/grunt) from 1.4.1 to 1.5.2.
- [Release notes](https://github.com/gruntjs/grunt/releases)
- [Changelog](https://github.com/gruntjs/grunt/blob/main/CHANGELOG)
- [Commits](https://github.com/gruntjs/grunt/compare/v1.4.1...v1.5.2)

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

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

website/package.json

@@ -30,7 +30,7 @@
     "autoprefixer": "10.3.4",
     "coffeelint": "2.1.0",
     "coffeescript": "2.5.1",
-    "grunt": "1.4.1",
+    "grunt": "1.5.2",
     "grunt-assets-inline": "1.2.4",
     "grunt-bump": "0.8.0",
     "grunt-cache-bust": "1.7.0",