Bump google-api-core from 1.12.0 to 1.13.0 (#6086)
Bump google-api-core from 1.12.0 to 1.13.0 (#6086)

Bumps [google-api-core](https://github.com/GoogleCloudPlatform/google-cloud-python) from 1.12.0 to 1.13.0.
- [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-1.12.0...storage-1.13.0)

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