chore(deps): bump mjml from 4.15.3 to 4.18.0 (#6394)

Bumps [mjml](https://github.com/mjmlio/mjml/tree/HEAD/packages/mjml) from 4.15.3 to 4.18.0.
- [Release notes](https://github.com/mjmlio/mjml/releases)
- [Commits](https://github.com/mjmlio/mjml/commits/v4.18.0/packages/mjml)

---
updated-dependencies:
- dependency-name: mjml
  dependency-version: 4.18.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]