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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [google-auth](https://togithub.com/googleapis/google-auth-library-python) | `==1.32.0` -> `==1.32.1` | [![age](https://badges.renovateapi.com/packages/pypi/google-auth/1.32.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/google-auth/1.32.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/google-auth/1.32.1/compatibility-slim/1.32.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/google-auth/1.32.1/confidence-slim/1.32.0)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>googleapis/google-auth-library-python</summary>

### [`v1.32.1`](https://togithub.com/googleapis/google-auth-library-python/blob/master/CHANGELOG.md#&#8203;1321-httpswwwgithubcomgoogleapisgoogle-auth-library-pythoncomparev1320v1321-2021-06-30)

[Compare Source](https://togithub.com/googleapis/google-auth-library-python/compare/v1.32.0...v1.32.1)

</details>

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* chore: use gapic-generator-python 0.50.3

fix: disable always_use_jwt_access

Committer: @busunkim96
PiperOrigin-RevId: 382142900

Source-Link: googleapis/googleapis@513440f

Source-Link: googleapis/googleapis-gen@7b1e2c3

* 🦉 Updates from OwlBot

See https://github.com/googleapis/repo-automation-bots/blob/master/packages/owl-bot/README.md

* fix: require google-api-core >= 1.26.0

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>
Co-authored-by: Bu Sun Kim <[email protected]>

#222)

* feat: `read_session` optional to `ReadRowsStream.rows()`

The schema from the first `ReadRowsResponse` message can be used to decode
messages, instead.

Note: `to_arrow()` and `to_dataframe()` do not work on an empty stream unless a
`read_session` has been passed in, as the schema is not available. This should
not affect `google-cloud-bigquery` and `pandas-gbq`, as those packages use the
lower-level message->dataframe/arrow methods.

* revert change to comment

* use else for empty arrow streams in try-except block

Co-authored-by: Tres Seaver <[email protected]>

* update docstring to reflect that readsession and readrowsresponse can be used interchangeably

* update arrow deserializer, too

Co-authored-by: Tres Seaver <[email protected]>

🤖 I have created a release \*beep\* \*boop\*
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## [2.6.0](https://www.github.com/googleapis/python-bigquery-storage/compare/v2.5.0...v2.6.0) (2021-07-09)


### Features

* `read_session` optional to `ReadRowsStream.rows()` ([#228](https://www.github.com/googleapis/python-bigquery-storage/issues/228)) ([4f56029](https://www.github.com/googleapis/python-bigquery-storage/commit/4f5602950a0c1959e332aa2964245b9caf4828c8))
* add always_use_jwt_access ([#223](https://www.github.com/googleapis/python-bigquery-storage/issues/223)) ([fd82417](https://www.github.com/googleapis/python-bigquery-storage/commit/fd824174fb044fbacc83c647f619fda556333e26))
---


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