deps: update dependency googleapis-common-protos to v1.56.4 (#171)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [googleapis-common-protos](https://togithub.com/googleapis/python-api-common-protos) | `==1.56.3` -> `==1.56.4` | [![age](https://badges.renovateapi.com/packages/pypi/googleapis-common-protos/1.56.4/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/googleapis-common-protos/1.56.4/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/googleapis-common-protos/1.56.4/compatibility-slim/1.56.3)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/googleapis-common-protos/1.56.4/confidence-slim/1.56.3)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>googleapis/python-api-common-protos</summary>

### [`v1.56.4`](https://togithub.com/googleapis/python-api-common-protos/blob/HEAD/CHANGELOG.md#&#8203;1564-httpsgithubcomgoogleapispython-api-common-protoscomparev1563v1564-2022-07-12)

[Compare Source](https://togithub.com/googleapis/python-api-common-protos/compare/v1.56.3...v1.56.4)

##### Bug Fixes

-   require python 3.7+ ([#&#8203;119](https://togithub.com/googleapis/python-api-common-protos/issues/119)) ([507b58d](https://togithub.com/googleapis/python-api-common-protos/commit/507b58dfa0516aedf57880b384e92cda97152398))

</details>

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