Bump @storybook/builder-webpack5 from 6.5.10 to 8.4.0

Bumps [@storybook/builder-webpack5](https://github.com/storybookjs/storybook/tree/HEAD/code/builders/builder-webpack5) from 6.5.10 to 8.4.0.
- [Release notes](https://github.com/storybookjs/storybook/releases)
- [Changelog](https://github.com/storybookjs/storybook/blob/next/CHANGELOG.md)
- [Commits](https://github.com/storybookjs/storybook/commits/v8.4.0/code/builders/builder-webpack5)

---
updated-dependencies:
- dependency-name: "@storybook/builder-webpack5"
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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