Bump esbuild and esbuild-sass-plugin in /assets

Bumps [esbuild](https://github.com/evanw/esbuild) and [esbuild-sass-plugin](https://github.com/glromeo/esbuild-sass-plugin). These dependencies needed to be updated together.

Updates `esbuild` from 0.18.20 to 0.25.0
- [Release notes](https://github.com/evanw/esbuild/releases)
- [Changelog](https://github.com/evanw/esbuild/blob/main/CHANGELOG-2023.md)
- [Commits](evanw/esbuild@v0.18.20...v0.25.0)

Updates `esbuild-sass-plugin` from 2.11.0 to 3.3.1
- [Release notes](https://github.com/glromeo/esbuild-sass-plugin/releases)
- [Commits](glromeo/esbuild-sass-plugin@v2.11.0...v3.3.1)

---
updated-dependencies:
- dependency-name: esbuild
  dependency-type: direct:development
- dependency-name: esbuild-sass-plugin
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>