Bump immutable (#37)

Bumps  and [immutable](https://github.com/immutable-js/immutable-js). These dependencies needed to be updated together.

Updates `immutable` from 4.3.0 to 4.3.8
- [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@v4.3.0...v4.3.8)

Updates `immutable` from 3.8.2 to 3.8.3
- [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@v4.3.0...v4.3.8)

---
updated-dependencies:
- dependency-name: immutable
  dependency-version: 4.3.8
  dependency-type: indirect
- dependency-name: immutable
  dependency-version: 3.8.3
  dependency-type: indirect
...

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Author: dependabot[bot]