fix(deps): update dependency immutability-helper to v2.9.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
immutability-helper	dependencies	minor	2.8.1 -> 2.9.1	source

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Release Notes

kolodny/immutability-helper

v2.9.1

Compare Source

Revert release to match 2.8.x since upgrading this release is not backwards compatible with typescript v2.x

v2.9.0

Compare Source

2.9.0

Huge thanks to @​jedmao for converting the library to typescript!

• New: TypeScript definitions are now generated from TypeScript source. meaning they will always be 100% in sync w/ the source code.
• New: exported Context class.
  • Deprecated: stop using const myUpdate = newContext().update and start using const myContext = new Context(); myContext.update(...).
• Deprecated: stop using update.extend and start using import { extend } from 'immutability-helper' or const { extend } = new Context().

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