Bump webpack from 5.88.2 to 5.94.0 in /site/gatsby-site (#3049)

Bumps [webpack](https://github.com/webpack/webpack) from 5.88.2 to 5.94.0.
- [Release notes](https://github.com/webpack/webpack/releases)
- [Commits](webpack/webpack@v5.88.2...v5.94.0)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: Kevin <[email protected]>
Co-authored-by: Cesar Varela <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>