Bump webpack from 5.1.3 to 5.76.0 in /drupal/modules/avoindata-header

Bumps [webpack](https://github.com/webpack/webpack) from 5.1.3 to 5.76.0.
- [Release notes](https://github.com/webpack/webpack/releases)
- [Commits](webpack/webpack@v5.1.3...v5.76.0)

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

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