[api] Update immutability-helper: 2.7.1 → 2.8.0 (minor)

[depfu]

We've updated a dependency and here is what you need to know:

name	version specification	old version	new version
immutability-helper	^2.7.1	2.7.1	2.8.0

You should probably take a good look at the info here and the test results before merging this pull request, of course.

What changed?

✳️ immutability-helper (2.7.1 → 2.8.0) · Repo

Release Notes

2.8.0

• Use conditional types to make types significantly safer and more robust
  Huge thanks to @seansfkelley and @andreiglingeanu!

Commits

See the full diff on Github. The new version differs by 4 commits:

• prepare for 2.8.0 release
• Use conditional types to make types significantly safer and more robust. (#108)
• prepare for 2.7.2 release
• Preserve reference equality for values in Maps

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