chore: bump @rollup/plugin-multi-entry from 4.1.0 to 6.0.0 in /web3.js

Bumps [@rollup/plugin-multi-entry](https://github.com/rollup/plugins/tree/HEAD/packages/multi-entry) from 4.1.0 to 6.0.0.
- [Release notes](https://github.com/rollup/plugins/releases)
- [Changelog](https://github.com/rollup/plugins/blob/master/packages/multi-entry/CHANGELOG.md)
- [Commits](https://github.com/rollup/plugins/commits/url-v6.0.0/packages/multi-entry)

---
updated-dependencies:
- dependency-name: "@rollup/plugin-multi-entry"
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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