…tamp

Issue #797: support auto-adding timestamp to pubsub messages.

* chore(deps): update all dependencies

* 🦉 Updates from OwlBot post-processor

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

---------

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

* chore(deps): update all dependencies

* 🦉 Updates from OwlBot post-processor

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

---------

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

* chore(deps): update all dependencies

* 🦉 Updates from OwlBot post-processor

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

---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>
Co-authored-by: Lingqing Gan <lingqing.gan@gmail.com>
Co-authored-by: Anthonios Partheniou <partheniou@google.com>

Certain APIs like RecommendationEngine use multiple enum variant
monikers to reference the same value. Achieving this in protos
requires explicit support from proto-plus and the generated surface.

Hand testing indicates compliance.

Bump the min proto-plus version for generated clients.

🤖 I have created a release \*beep\* \*boop\*
---
## [0.43.0](https://www.github.com/googleapis/gapic-generator-python/compare/v0.42.2...v0.43.0) (2021-03-11)


### Features

* add bazel support for gapic metadata ([#811](https://www.github.com/googleapis/gapic-generator-python/issues/811)) ([7ced24a](https://www.github.com/googleapis/gapic-generator-python/commit/7ced24a0b20cb6505587b946c03b1b038eef4b4a))
* update templates to permit enum aliases ([#809](https://www.github.com/googleapis/gapic-generator-python/issues/809)) ([2e7ea11](https://www.github.com/googleapis/gapic-generator-python/commit/2e7ea11f80210459106f9780e5f013e2a0381d29))
---


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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) | `==3.19.0` -> `==3.20.0` | [![age](https://badges.renovateapi.com/packages/pypi/google-cloud-spanner/3.20.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/google-cloud-spanner/3.20.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/google-cloud-spanner/3.20.0/compatibility-slim/3.19.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/google-cloud-spanner/3.20.0/confidence-slim/3.19.0)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

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

### [`v3.20.0`](https://togithub.com/googleapis/python-spanner/blob/HEAD/CHANGELOG.md#&#8203;3200-httpsgithubcomgoogleapispython-spannercomparev3190v3200-2022-08-30)

[Compare Source](https://togithub.com/googleapis/python-spanner/compare/v3.19.0...v3.20.0)

##### Features

-   Adds TypeAnnotationCode PG_JSONB ([#&#8203;792](https://togithub.com/googleapis/python-spanner/issues/792)) ([6a661d4](https://togithub.com/googleapis/python-spanner/commit/6a661d4492bcb77abee60095ffc2cfdc06b48124))

##### Bug Fixes

-   if JsonObject serialized to None then return `null_value` instead of `string_value` ([#&#8203;771](https://togithub.com/googleapis/python-spanner/issues/771)) ([82170b5](https://togithub.com/googleapis/python-spanner/commit/82170b521f0da1ba5aaf064ba9ee50c74fe21a86))

</details>

---

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