chore: bump cordova-ios from 7.1.1 to 8.0.0 in /example

Bumps [cordova-ios](https://github.com/apache/cordova-ios) from 7.1.1 to 8.0.0.
- [Release notes](https://github.com/apache/cordova-ios/releases)
- [Changelog](https://github.com/apache/cordova-ios/blob/master/RELEASENOTES.md)
- [Commits](apache/cordova-ios@7.1.1...8.0.0)

---
updated-dependencies:
- dependency-name: cordova-ios
  dependency-version: 8.0.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]