Bump mjml from 5.2.2 to 5.3.0

Bumps [mjml](https://github.com/mjmlio/mjml/tree/HEAD/packages/mjml) from 5.2.2 to 5.3.0.
- [Release notes](https://github.com/mjmlio/mjml/releases)
- [Commits](https://github.com/mjmlio/mjml/commits/v5.3.0/packages/mjml)

---
updated-dependencies:
- dependency-name: mjml
  dependency-version: 5.3.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

package.json

@@ -11,7 +11,7 @@
     "jquery": "^4.0.0",
     "jquery-ui": "^1.14.2",
     "minimist": "^1.2.8",
-    "mjml": "^5.2.2",
+    "mjml": "^5.3.0",
     "smartmenus": "^1.2.1",
     "yarn": "^1.22.22"
   }