Bump govuk_tech_docs from 2.3.0 to 2.4.2
Bump govuk_tech_docs from 2.3.0 to 2.4.2

Bumps [govuk_tech_docs](https://github.com/alphagov/tech-docs-gem) from 2.3.0 to 2.4.2.
- [Release notes](https://github.com/alphagov/tech-docs-gem/releases)
- [Changelog](https://github.com/alphagov/tech-docs-gem/blob/master/CHANGELOG.md)
- [Commits](https://github.com/alphagov/tech-docs-gem/compare/v2.3.0...v2.4.2)

---
updated-dependencies:
- dependency-name: govuk_tech_docs
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
alphagov/govuk-developer-docs,alphagov/govuk-developer-docs,alphagov/govuk-developer-docs,alphagov/govuk-developer-docs