Update dependency grunt to v1.2.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
grunt (source)	devDependencies	patch	1.2.0 -> 1.2.1

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Release Notes

gruntjs/grunt

### [`v1.2.1`](https://togithub.com/gruntjs/grunt/releases/v1.2.1) [Compare Source](https://togithub.com/gruntjs/grunt/compare/v1.2.0...v1.2.1) - Changelog update [`ae11839`](https://togithub.com/gruntjs/grunt/commit/ae11839) - Merge pull request [#​1715](https://togithub.com/gruntjs/grunt/issues/1715) from sibiraj-s/remove-path-is-absolute [`9d23cb6`](https://togithub.com/gruntjs/grunt/commit/9d23cb6) - Remove path-is-absolute dependency [`e789b1f`](https://togithub.com/gruntjs/grunt/commit/e789b1f)

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