Update dependency grunt to v1.0.3

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
grunt	devDependencies	patch	1.0.1 -> 1.0.3	homepage, source

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Release Notes

gruntjs/grunt

### [`v1.0.3`](https://renovatebot.com/gh/gruntjs/grunt/compare/v1.0.2...v1.0.3) [Compare Source](https://renovatebot.com/gh/gruntjs/grunt/compare/v1.0.2...v1.0.3) ### [`v1.0.2`](https://renovatebot.com/gh/gruntjs/grunt/compare/v1.0.1...v1.0.2) [Compare Source](https://renovatebot.com/gh/gruntjs/grunt/compare/v1.0.1...v1.0.2)

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