[charts] Replace ESM extensions by .mjs

[alexfauquette]

Fix @Janpot comment

[Janpot]

I believe the exports field needs to be updated as well

mui-x/packages/x-charts-vendor/package.json

Line 22 in cf441ec

"import": "./es/*.js",

Just to note, the .mjs extension is not critical or anything. It's just to extra minimize the chance for confusion of the tooling

[mui-bot]

Deploy preview: https://deploy-preview-14387--material-ui-x.netlify.app/

Generated by 🚫 dangerJS against 0f92e2e

[codspeed-hq]

CodSpeed Performance Report

Merging #14387 will not alter performance

_{Comparing alexfauquette:ESM-vendore (0f92e2e) with master (cf441ec)}

Summary

✅ 3 untouched benchmarks

[alexfauquette]

Just to note, the .mjs extension is not critical or anything. It's just to extra minimize the chance for confusion of tools

It's such a quick win, that I prefer to do it now instead of adding it to the todo :)