Bump grunt from 1.4.1 to 1.6.1

Bumps [grunt](https://github.com/gruntjs/grunt) from 1.4.1 to 1.6.1.
- [Release notes](https://github.com/gruntjs/grunt/releases)
- [Changelog](https://github.com/gruntjs/grunt/blob/main/CHANGELOG)
- [Commits](gruntjs/grunt@v1.4.1...v1.6.1)

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

Signed-off-by: dependabot[bot] <[email protected]>
Pull Request: #356
Change-Id: Ic7da64a364ccd38223f3040e7d763d83a6e8c8f8

Author: Addbot

package-lock.json

@@ -41,7 +41,7 @@
 		"apollo-boost": "^0.4.9",
 		"cross-fetch": "^3.1.5",
 		"eslint-config-wikimedia": "0.22.1",
-		"grunt": "1.4.1",
+		"grunt": "1.6.1",
 		"grunt-banana-checker": "0.10.0",
 		"grunt-eslint": "24.0.0",
 		"grunt-stylelint": "^0.18.0",