Bump form-data and mattermost-redux in /webapp

Bumps [form-data](https://github.com/form-data/form-data) to 3.0.4 and updates ancestor dependency [mattermost-redux](https://github.com/mattermost/mattermost/tree/HEAD/webapp/platform/mattermost-redux). These dependencies need to be updated together.


Updates `form-data` from 3.0.1 to 3.0.4
- [Release notes](https://github.com/form-data/form-data/releases)
- [Changelog](https://github.com/form-data/form-data/blob/v3.0.4/CHANGELOG.md)
- [Commits](form-data/form-data@v3.0.1...v3.0.4)

Updates `mattermost-redux` from 5.33.1 to 10.8.0
- [Release notes](https://github.com/mattermost/mattermost/releases)
- [Changelog](https://github.com/mattermost/mattermost/blob/master/CHANGELOG.md)
- [Commits](https://github.com/mattermost/mattermost/commits/[email protected]/webapp/platform/mattermost-redux)

---
updated-dependencies:
- dependency-name: form-data
  dependency-version: 3.0.4
  dependency-type: indirect
- dependency-name: mattermost-redux
  dependency-version: 10.8.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]