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Bump webpack from 5.39.1 to 5.76.1 in /website (#489)

Bumps [webpack](https://github.com/webpack/webpack) from 5.39.1 to 5.76.1.
- [Release notes](https://github.com/webpack/webpack/releases

)
- [Commits](webpack/webpack@v5.39.1...v5.76.1)

---
updated-dependencies:
- dependency-name: webpack
  dependency-type: indirect
...
Signed-off-by: dependabot[bot] <support@github.com>