fix: don't use .mjs file for react-native, which isn't supported by default. Fixes #1058 #1065

[mweststrate]

pre-published as immer@10.0.3-beta

[github-actions]

Pull Request Test Coverage Report for Build 6285188608

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 99.793%

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Totals
Change from base Build 4929177933:	0.0%
Covered Lines:	646
Relevant Lines:	647

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💛 - Coveralls

[markerikson]

It looks like RN 0.72 will help with this by finally supporting exports properly, but yeah, this might be necessary to support the rest of the ecosystem until they catch up:

• https://reactnative.dev/blog/2023/06/21/package-exports-support

[markerikson]

Looking at https://facebook.github.io/metro/docs/package-exports/ , it sounds like Metro currently looks for "react-native", "browser", and "main":

• https://facebook.github.io/metro/docs/package-exports/
• https://github.com/facebook/metro/blob/179205b908b6ed4e458f35b852bb8304bb225652/docs/Configuration.md?plain=1#L230

I see that Immer actually does list "react-native". The Redux packages don't, but do list "main", and in our current Redux betas, I am pointing "main" to that similar legacy-esm.js file. So, I think we've got the same net result.

[github-actions]

🎉 This PR is included in version 10.0.3 🎉

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