chore: bump esbuild and vite in /web/prql-codemirror-demo

Removes [esbuild](https://github.com/evanw/esbuild). It's no longer used after updating ancestor dependency [vite](https://github.com/vitejs/vite/tree/HEAD/packages/vite). These dependencies need to be updated together.


Removes `esbuild`

Updates `vite` from 6.4.2 to 8.0.16
- [Release notes](https://github.com/vitejs/vite/releases)
- [Changelog](https://github.com/vitejs/vite/blob/main/packages/vite/CHANGELOG.md)
- [Commits](https://github.com/vitejs/vite/commits/v8.0.16/packages/vite)

---
updated-dependencies:
- dependency-name: esbuild
  dependency-version:
  dependency-type: indirect
- dependency-name: vite
  dependency-version: 8.0.16
  dependency-type: direct:development
...

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Author: dependabot[bot]