Bump load-grunt-tasks from 5.0.0 to 5.1.0

Bumps [load-grunt-tasks](https://github.com/sindresorhus/load-grunt-tasks) from 5.0.0 to 5.1.0.
- [Release notes](https://github.com/sindresorhus/load-grunt-tasks/releases)
- [Commits](sindresorhus/load-grunt-tasks@v5.0.0...v5.1.0)

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