Bump load-grunt-tasks from 3.5.2 to 5.1.0

Bumps [load-grunt-tasks](https://github.com/sindresorhus/load-grunt-tasks) from 3.5.2 to 5.1.0.
- [Release notes](https://github.com/sindresorhus/load-grunt-tasks/releases)
- [Commits](sindresorhus/load-grunt-tasks@v3.5.2...v5.1.0)

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

package.json

@@ -39,7 +39,7 @@
     "jest": "^23.6.0",
     "jest-flow-transform": "^1.0.1",
     "jsdoc-babel": "^0.5.0",
-    "load-grunt-tasks": "^3.1.0",
+    "load-grunt-tasks": "^5.1.0",
     "minami": "^1.2.3",
     "opn-cli": "^3.1.0",
     "time-grunt": "^1.1.0",