[dependency]: bump assert from 2.0.0 to 2.1.0 in /explorer/frontend

Bumps [assert](https://github.com/browserify/commonjs-assert) from 2.0.0 to 2.1.0.
- [Release notes](https://github.com/browserify/commonjs-assert/releases)
- [Changelog](https://github.com/browserify/commonjs-assert/blob/main/CHANGELOG.md)
- [Commits](browserify/commonjs-assert@v2.0.0...v2.1.0)

---
updated-dependencies:
- dependency-name: assert
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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