Using 'fields' in Blob.exists() to reduce payload size.

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>

…p/templates/python_library/.kokoro (#731)

Source-Link: googleapis/synthtool@e13b22b
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-python:latest@sha256:97b671488ad548ef783a452a9e1276ac10f144d5ae56d98cc4bf77ba504082b4

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

* feat: add mtls support to rest transport

* update

* update

* update

Source-Link: googleapis/synthtool@cb96037
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-python:latest@sha256:2d816f26f728ac8b24248741e7d4c461c09764ef9f7be3684d557c9632e46dbd

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

Source-Link: googleapis/synthtool@92006bb
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-python:latest@sha256:2e247c7bf5154df7f98cce087a20ca7605e236340c7d6d1a14447e5c06791bd6

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

`Model.get_or_insert` can now handle and disambiguate arguments for
model properties with the same name as other options, such as `name`,
`cls`, `parent`, `timeout`, etc... This restores behavior of legacy NDB
version.

Fixes #729

Source-Link: googleapis/synthtool@92006bb
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-python:latest@sha256:2e247c7bf5154df7f98cce087a20ca7605e236340c7d6d1a14447e5c06791bd6

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

#731)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [google-cloud-bigquery-storage](https://togithub.com/googleapis/python-bigquery-storage) | `==2.4.0` -> `==2.5.0` | [![age](https://badges.renovateapi.com/packages/pypi/google-cloud-bigquery-storage/2.5.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/google-cloud-bigquery-storage/2.5.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/google-cloud-bigquery-storage/2.5.0/compatibility-slim/2.4.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/google-cloud-bigquery-storage/2.5.0/confidence-slim/2.4.0)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

<details>
<summary>googleapis/python-bigquery-storage</summary>

### [`v2.5.0`](https://togithub.com/googleapis/python-bigquery-storage/blob/master/CHANGELOG.md#&#8203;250-httpswwwgithubcomgoogleapispython-bigquery-storagecomparev240v250-2021-06-29)

[Compare Source](https://togithub.com/googleapis/python-bigquery-storage/compare/v2.4.0...v2.5.0)

##### ⚠ BREAKING CHANGES

-   remove default deadline for AppendRows API ([#&#8203;205](https://togithub.com/googleapis/python-bigquery-storage/issues/205))

##### Features

-   Add ZSTD compression as an option for Arrow ([#&#8203;197](https://www.github.com/googleapis/python-bigquery-storage/issues/197)) ([f941446](https://www.github.com/googleapis/python-bigquery-storage/commit/f9414469fac37bf05db28230a1a6c1e3f7342e8d))
-   new JSON type through BigQuery Write ([#&#8203;178](https://www.github.com/googleapis/python-bigquery-storage/issues/178)) ([a6d6afa](https://www.github.com/googleapis/python-bigquery-storage/commit/a6d6afa8654907701aab2724f940be8f63edd0ea))

##### Bug Fixes

-   **deps:** add packaging requirement ([#&#8203;200](https://www.github.com/googleapis/python-bigquery-storage/issues/200)) ([f2203fe](https://www.github.com/googleapis/python-bigquery-storage/commit/f2203fefe36dd043a258adb85e970fef14cf6ebc))
-   remove default deadline for AppendRows API ([#&#8203;205](https://www.github.com/googleapis/python-bigquery-storage/issues/205)) ([cd4e637](https://www.github.com/googleapis/python-bigquery-storage/commit/cd4e637c4c74f21be50c3b0ebdfeebb1dfb88cbb))

##### Documentation

-   omit mention of Python 2.7 in 'CONTRIBUTING.rst' ([#&#8203;1127](https://www.github.com/googleapis/python-bigquery-storage/issues/1127)) ([#&#8203;212](https://www.github.com/googleapis/python-bigquery-storage/issues/212)) ([8bcc4cd](https://www.github.com/googleapis/python-bigquery-storage/commit/8bcc4cd298eb0f5da03ecf66670982ab41e35c88))

##### Miscellaneous Chores

-   release 2.5.0 ([#&#8203;220](https://www.github.com/googleapis/python-bigquery-storage/issues/220)) ([946c8a9](https://www.github.com/googleapis/python-bigquery-storage/commit/946c8a91c2d74c6bf37b333a4d0483f4483dcbce))

</details>

---

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* chor: GA release for django spanner library

* docs: add GA pypi and python version images in readme file

* chor: bump version number as GA release has major updates