Bump grunt and grunt-contrib-watch

Bumps [grunt](https://github.com/gruntjs/grunt) and [grunt-contrib-watch](https://github.com/gruntjs/grunt-contrib-watch). These dependencies needed to be updated together.

Updates `grunt` from 0.4.5 to 1.6.1
- [Release notes](https://github.com/gruntjs/grunt/releases)
- [Changelog](https://github.com/gruntjs/grunt/blob/main/CHANGELOG)
- [Commits](gruntjs/grunt@v0.4.5...v1.6.1)

Updates `grunt-contrib-watch` from 0.6.1 to 1.1.0
- [Changelog](https://github.com/gruntjs/grunt-contrib-watch/blob/main/CHANGELOG)
- [Commits](gruntjs/grunt-contrib-watch@v0.6.1...v1.1.0)

---
updated-dependencies:
- dependency-name: grunt
  dependency-version: 1.6.1
  dependency-type: direct:development
- dependency-name: grunt-contrib-watch
  dependency-version: 1.1.0
  dependency-type: direct:development
...

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

Author: dependabot[bot]