Bump grunt from 1.0.3 to 1.5.2
Bump grunt from 1.0.3 to 1.5.2

Bumps [grunt](https://github.com/gruntjs/grunt) from 1.0.3 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/v1.0.3...v1.5.2)

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

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
bramstein/fontfaceobserver,bramstein/fontfaceobserver