chore(deps): update dependency google-cloud-spanner to v3.22.1

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
google-cloud-spanner	==3.22.0 -> ==3.22.1

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Release Notes

googleapis/python-spanner

### [`v3.22.1`](https://togithub.com/googleapis/python-spanner/blob/HEAD/CHANGELOG.md#​3221-httpsgithubcomgoogleapispython-spannercomparev3220v3221-2022-10-04) [Compare Source](https://togithub.com/googleapis/python-spanner/compare/v3.22.0...v3.22.1) ##### Bug Fixes - **deps:** Require protobuf >= 3.20.2 ([#​830](https://togithub.com/googleapis/python-spanner/issues/830)) ([4d71563](https://togithub.com/googleapis/python-spanner/commit/4d7156376f4633de6c1a2bfd25ba97126386ebd0)) ##### Documentation - **samples:** add samples for CMMR phase 2 ([4282340](https://togithub.com/googleapis/python-spanner/commit/4282340bc2c3a34496c59c33f5c64ff76dceda4c))

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