Bump grunt from 1.6.1 to 1.6.2 in /www

Bumps [grunt](https://github.com/gruntjs/grunt) from 1.6.1 to 1.6.2.
- [Release notes](https://github.com/gruntjs/grunt/releases)
- [Changelog](https://github.com/gruntjs/grunt/blob/main/CHANGELOG)
- [Commits](gruntjs/grunt@v1.6.1...v1.6.2)

---
updated-dependencies:
- dependency-name: grunt
  dependency-version: 1.6.2
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

www/package-lock.json

@@ -22,7 +22,7 @@
     "@lodder/grunt-postcss": "^3.1.1",
     "@lodder/time-grunt": "^4.0.0",
     "autoprefixer": "^10.5.0",
-    "grunt": "^1.6.1",
+    "grunt": "^1.6.2",
     "grunt-contrib-clean": "^2.0.1",
     "grunt-contrib-concat": "^2.1.0",
     "grunt-contrib-connect": "^5.0.1",