Bump immutable from 4.2.4 to 4.3.7 (#13760)

Bumps [immutable](https://github.com/immutable-js/immutable-js) from 4.2.4 to 4.3.7.
- [Release notes](https://github.com/immutable-js/immutable-js/releases)
- [Changelog](https://github.com/immutable-js/immutable-js/blob/main/CHANGELOG.md)
- [Commits](immutable-js/immutable-js@v4.2.4...v4.3.7)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

packages/rich-text/package.json

@@ -45,7 +45,7 @@
     "draft-js-import-element": "https://github.com/swissspidy/draft-js-import-element",
     "draft-js-import-html": "^1.4.1",
     "draftjs-filters": "^3.0.1",
-    "immutable": "^4.3.6",
+    "immutable": "^4.3.7",
     "prop-types": "^15.7.2"
   },
   "devDependencies": {