Bump minimist, handlebars, mkdirp and mocha in /hooks

Bumps [minimist](https://github.com/minimistjs/minimist) to 1.2.8 and updates ancestor dependencies [minimist](https://github.com/minimistjs/minimist), [handlebars](https://github.com/wycats/handlebars.js), [mkdirp](https://github.com/isaacs/node-mkdirp) and [mocha](https://github.com/mochajs/mocha). These dependencies need to be updated together.


Updates `minimist` from 0.0.8 to 1.2.8
- [Release notes](https://github.com/minimistjs/minimist/releases)
- [Changelog](https://github.com/minimistjs/minimist/blob/main/CHANGELOG.md)
- [Commits](https://github.com/minimistjs/minimist/compare/v0.0.8...v1.2.8)

Updates `handlebars` from 4.1.2 to 4.7.7
- [Release notes](https://github.com/wycats/handlebars.js/releases)
- [Changelog](https://github.com/handlebars-lang/handlebars.js/blob/master/release-notes.md)
- [Commits](https://github.com/wycats/handlebars.js/compare/v4.1.2...v4.7.7)

Updates `mkdirp` from 0.5.1 to 0.5.4
- [Release notes](https://github.com/isaacs/node-mkdirp/releases)
- [Changelog](https://github.com/isaacs/node-mkdirp/blob/main/CHANGELOG.md)
- [Commits](https://github.com/isaacs/node-mkdirp/compare/0.5.1...v0.5.4)

Updates `mocha` from 6.0.2 to 6.2.3
- [Release notes](https://github.com/mochajs/mocha/releases)
- [Changelog](https://github.com/mochajs/mocha/blob/master/CHANGELOG.md)
- [Commits](https://github.com/mochajs/mocha/compare/v6.0.2...v6.2.3)

---
updated-dependencies:
- dependency-name: minimist
  dependency-type: indirect
- dependency-name: handlebars
  dependency-type: indirect
- dependency-name: mkdirp
  dependency-type: indirect
- dependency-name: mocha
  dependency-type: direct:development
...

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

hooks/package.json

@@ -34,7 +34,7 @@
     "@types/mocha": "^5.2.6",
     "chai": "^4.2.0",
     "istanbul": "^0.4.5",
-    "mocha": "^6.0.2",
+    "mocha": "^6.2.3",
     "mocha-typescript": "^1.0.23",
     "ts-node": "^8.0.2",
     "tslint": "^5.13.0",