Bump webpack from 1.15.0 to 5.94.0 in /legacy

Bumps [webpack](https://github.com/webpack/webpack) from 1.15.0 to 5.94.0.
- [Release notes](https://github.com/webpack/webpack/releases)
- [Commits](webpack/webpack@v1.15.0...v5.94.0)

---
updated-dependencies:
- dependency-name: webpack
  dependency-type: direct:development
...

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