fix(deps)(example): incorrect peer dependency version of three

[rnike]

Saw a lot of warnings in the console on the demo site (https://zustand-demo.pmnd.rs/),

the reason is because the incorrect dependency of three,

downgrade three to version 0.120.1 the warnings no longer exist.

Related issue: pmndrs/postprocessing#246

[codesandbox-ci]

This pull request is automatically built and testable in CodeSandbox.

To see build info of the built libraries, click here or the icon next to each commit SHA.

Latest deployment of this branch, based on commit 3c1dd78:

Sandbox	Source
React	Configuration
React Typescript	Configuration
React Browserify	Configuration
React Snowpack	Configuration
React Parcel	Configuration
Next.js	Configuration

[dai-shi]

I'm afraid someone will update it in the future without noticing, but it looks fine for now.

[rnike]

Another solution is to upgrade react-postprocessing, I've tried but it needs to upgrade a lot of related dependencies(including react & react-dom), and the tree shaking of the three package written in config-overrides.js also needs a refactor or rewrite, the diff will be massive if I am going to do that, I chose the simplest solution in this PR.

@dai-shi I have a question here, what do you or the team think of upgrading dependencies for the example? Want to know in your opinion if doing this is valuable or not.

[dai-shi]

examples folder is not actively maintained by me or the team. It's improved by a few contributors including you.
I'm fine with dropping react-app-rewired and customize-cra, which complicate things.
#968 is also related.

[rnike]

got it, might take a look when I have time