fix(deps): bump @capacitor/core from 3.4.0 to 3.9.0 in /frontend

Bumps [@capacitor/core](https://github.com/ionic-team/capacitor) from 3.4.0 to 3.9.0.
- [Release notes](https://github.com/ionic-team/capacitor/releases)
- [Changelog](https://github.com/ionic-team/capacitor/blob/3.9.0/CHANGELOG.md)
- [Commits](ionic-team/capacitor@3.4.0...3.9.0)

---
updated-dependencies:
- dependency-name: "@capacitor/core"
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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