Bump grunt from 1.6.1 to 1.6.2

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]

package.json

@@ -10,7 +10,7 @@
     "url": "https://github.com/textpattern/textpattern.github.io/issues"
   },
   "devDependencies": {
-    "grunt": "1.6.1",
+    "grunt": "1.6.2",
     "grunt-cli": "1.5.0",
     "grunt-contrib-uglify": "5.2.2",
     "load-grunt-tasks": "5.1.0"