fix(deps): update dependency immer to v9.0.21

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
immer	9.0.19 -> 9.0.21

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Release Notes

immerjs/immer

### [`v9.0.21`](https://togithub.com/immerjs/immer/releases/tag/v9.0.21) [Compare Source](https://togithub.com/immerjs/immer/compare/v9.0.20...v9.0.21) ##### Bug Fixes - ensure type exports is first in package.json export declaration ([#​1018](https://togithub.com/immerjs/immer/issues/1018)) ([b6ccd0f](https://togithub.com/immerjs/immer/commit/b6ccd0f5341cef267c4db816cc28f4df4a5846dd)) ### [`v9.0.20`](https://togithub.com/immerjs/immer/releases/tag/v9.0.20) [Compare Source](https://togithub.com/immerjs/immer/compare/v9.0.19...v9.0.20) ##### Bug Fixes - patching maps failed when using number keys ([#​1025](https://togithub.com/immerjs/immer/issues/1025)) ([dd83e2e](https://togithub.com/immerjs/immer/commit/dd83e2e2db0c16e44986feeb3429fe2b7662b2b5))

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