Bump nanoid and gulp-mocha

Bumps [nanoid](https://github.com/ai/nanoid) to 3.3.3 and updates ancestor dependency [gulp-mocha](https://github.com/sindresorhus/gulp-mocha). These dependencies need to be updated together.


Updates `nanoid` from 3.1.20 to 3.3.3
- [Release notes](https://github.com/ai/nanoid/releases)
- [Changelog](https://github.com/ai/nanoid/blob/main/CHANGELOG.md)
- [Commits](ai/nanoid@3.1.20...3.3.3)

Updates `gulp-mocha` from 8.0.0 to 9.0.0
- [Release notes](https://github.com/sindresorhus/gulp-mocha/releases)
- [Commits](sindresorhus/gulp-mocha@v8.0.0...v9.0.0)

---
updated-dependencies:
- dependency-name: nanoid
  dependency-type: indirect
- dependency-name: gulp-mocha
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>