build(deps): bump google-cloud-storage in /examples/python
build(deps): bump google-cloud-storage in /examples/python

Bumps [google-cloud-storage](https://github.com/GoogleCloudPlatform/google-cloud-python) from 1.19.1 to 1.20.0.
- [Release notes](https://github.com/GoogleCloudPlatform/google-cloud-python/releases)
- [Changelog](https://github.com/googleapis/google-cloud-python/blob/master/CHANGELOG.md)
- [Commits](https://github.com/GoogleCloudPlatform/google-cloud-python/compare/storage-1.19.1...storage-1.20.0)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
fsouza/fake-gcs-server,fsouza/fake-gcs-server