chore(deps-dev): bump webpack from 5.76.3 to 5.99.6 in /webapp

Bumps [webpack](https://github.com/webpack/webpack) from 5.76.3 to 5.99.6.
- [Release notes](https://github.com/webpack/webpack/releases)
- [Commits](webpack/webpack@v5.76.3...v5.99.6)

---
updated-dependencies:
- dependency-name: webpack
  dependency-version: 5.99.6
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]