fix(bigquerystorage): sync __version__ with PyPI

[tswast]

Out-of-date version is causing issues with prerelease tests.

Thank you for opening a Pull Request! Before submitting your PR, there are a few things you can do to make sure it goes smoothly:

• Make sure to open an issue as a bug/issue before writing your code! That way we can discuss the change, evaluate designs, and agree on the general idea
• Ensure the tests and linter pass
• Code coverage does not decrease (if any source code was changed)
• Appropriate docs were updated (if necessary)

See test failures in googleapis/python-bigquery-magics#142

               raise exceptions.LegacyBigQueryStorageError(msg)
E               google.cloud.bigquery.exceptions.LegacyBigQueryStorageError: Dependency google-cloud-bigquery-storage is outdated, please upgrade it to version >= 2.0.0 (version found: 0.0.0).

🦕