Bump minimatch and grunt

Bumps [minimatch](https://github.com/isaacs/minimatch) to 3.1.5 and updates ancestor dependency [grunt](https://github.com/gruntjs/grunt). These dependencies need to be updated together.


Updates `minimatch` from 3.0.8 to 3.1.5
- [Changelog](https://github.com/isaacs/minimatch/blob/main/changelog.md)
- [Commits](isaacs/minimatch@v3.0.8...v3.1.5)

Updates `grunt` from 1.5.3 to 1.6.2
- [Release notes](https://github.com/gruntjs/grunt/releases)
- [Changelog](https://github.com/gruntjs/grunt/blob/main/CHANGELOG)
- [Commits](gruntjs/grunt@v1.5.3...v1.6.2)

---
updated-dependencies:
- dependency-name: minimatch
  dependency-version: 3.1.5
  dependency-type: indirect
- dependency-name: grunt
  dependency-version: 1.6.2
  dependency-type: direct:development
...

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Author: dependabot[bot]