chore(deps-dev): bump immutable in /wp-content/themes/terraso

Bumps [immutable](https://github.com/immutable-js/immutable-js) from 4.3.6 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@v4.3.6...v4.3.7)

---
updated-dependencies:
- dependency-name: immutable
  dependency-type: indirect
  update-type: version-update:semver-patch
...

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