fix(deps): bump contentful-management from 10.21.2 to 10.21.4

Bumps [contentful-management](https://github.com/contentful/contentful-management.js) from 10.21.2 to 10.21.4.
- [Release notes](https://github.com/contentful/contentful-management.js/releases)
- [Changelog](https://github.com/contentful/contentful-management.js/blob/master/CHANGELOG.md)
- [Commits](contentful/contentful-management.js@v10.21.2...v10.21.4)

---
updated-dependencies:
- dependency-name: contentful-management
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

apps/smartling/frontend/package.json

@@ -29,7 +29,7 @@
     "@contentful/forma-36-fcss": "^0.3.5",
     "@contentful/forma-36-react-components": "^3.100.7",
     "@contentful/forma-36-tokens": "^0.11.2",
-    "contentful-management": "10.21.2",
+    "contentful-management": "10.21.4",
     "lodash.get": "^4.4.2",
     "prop-types": "^15.7.2",
     "react": "^17.0.2",