Bump json5, markdown-doctest and webpack in /cdn/lodash

Bumps [json5](https://github.com/json5/json5) to 2.2.2 and updates ancestor dependencies [json5](https://github.com/json5/json5), [markdown-doctest](https://github.com/Widdershin/markdown-doctest) and [webpack](https://github.com/webpack/webpack). These dependencies need to be updated together.


Updates `json5` from 0.5.1 to 2.2.2
- [Release notes](https://github.com/json5/json5/releases)
- [Changelog](https://github.com/json5/json5/blob/main/CHANGELOG.md)
- [Commits](json5/json5@v0.5.1...v2.2.2)

Updates `markdown-doctest` from 0.9.1 to 1.1.0
- [Release notes](https://github.com/Widdershin/markdown-doctest/releases)
- [Commits](Widdershin/markdown-doctest@v0.9.1...v1.1.0)

Updates `webpack` from 1.15.0 to 5.75.0
- [Release notes](https://github.com/webpack/webpack/releases)
- [Commits](webpack/webpack@v1.15.0...v5.75.0)

---
updated-dependencies:
- dependency-name: json5
  dependency-type: indirect
- dependency-name: markdown-doctest
  dependency-type: direct:development
- dependency-name: webpack
  dependency-type: direct:development
...

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