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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [google-cloud-spanner](https://togithub.com/googleapis/python-spanner) | `==3.7.0` -> `==3.8.0` | [![age](https://badges.renovateapi.com/packages/pypi/google-cloud-spanner/3.8.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/google-cloud-spanner/3.8.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/google-cloud-spanner/3.8.0/compatibility-slim/3.7.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/google-cloud-spanner/3.8.0/confidence-slim/3.7.0)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

<details>
<summary>googleapis/python-spanner</summary>

### [`v3.8.0`](https://togithub.com/googleapis/python-spanner/blob/master/CHANGELOG.md#&#8203;380-httpswwwgithubcomgoogleapispython-spannercomparev370v380-2021-08-15)

[Compare Source](https://togithub.com/googleapis/python-spanner/compare/v3.7.0...v3.8.0)

##### Features

-   use DML batches in `executemany()` method ([#&#8203;412](https://www.togithub.com/googleapis/python-spanner/issues/412)) ([cbb4ee3](https://www.github.com/googleapis/python-spanner/commit/cbb4ee3eca9ac878b4f3cd78cfcfe8fc1acb86f9))

##### Bug Fixes

-   **samples:** batch_update() results processing error ([#&#8203;484](https://www.togithub.com/googleapis/python-spanner/issues/484)) ([bdd5f8b](https://www.github.com/googleapis/python-spanner/commit/bdd5f8b201d1b442837d4fca1d631fe171e276b9))

</details>

---

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* tests: bump instance operation timeout to 120 seconds

Toward #524.

* tests: bump instance operation timeout to 240 seconds

Likewise for samples instance creation.

Consensus from today's meeting is that testing against prereleases needs to happen outside the normal presubmit path.

Reverts only part of PR #479.

Follow-on to PR #481.

* tests: use datetime.now() to ensure DST is handled correctly

* 🦉 Updates from OwlBot

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

* test: change fixture scope

* 🦉 Updates from OwlBot

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

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

* test: adjust version time to avoid future timestamp error

* 🦉 Updates from OwlBot

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

* fix: use None when encryption config is empty

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

* add support for JSON- proto changes

* adding json support-synth tool

* deleting synth.metadata

* Revert "add support for JSON- proto changes"

This reverts commit a2f111c.

* json changes

* json changes

* json changes

* sorting keys and adding separators

* adding changes to system test case

* removing extra spaces

* lint changes

* changes to test_session

* changes for lint

Co-authored-by: Zoe <zoc@google.com>
Co-authored-by: larkee <31196561+larkee@users.noreply.github.com>

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