deps: update dependency com.google.cloud:google-cloud-spanner-bom to v6.30.1 (#973)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-spanner-bom](https://togithub.com/googleapis/java-spanner) | `6.30.0` -> `6.30.1` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-bom/6.30.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-bom/6.30.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-bom/6.30.1/compatibility-slim/6.30.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-bom/6.30.1/confidence-slim/6.30.0)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v6.30.1`](https://togithub.com/googleapis/java-spanner/blob/HEAD/CHANGELOG.md#&#8203;6301-httpsgithubcomgoogleapisjava-spannercomparev6300v6301-2022-09-20)

[Compare Source](https://togithub.com/googleapis/java-spanner/compare/v6.30.0...v6.30.1)

##### Dependencies

-   Update dependency com.google.cloud:google-cloud-monitoring to v3.4.4 ([#&#8203;2014](https://togithub.com/googleapis/java-spanner/issues/2014)) ([9cebad4](https://togithub.com/googleapis/java-spanner/commit/9cebad485afc8b8d94bd4bc1673542a330451fbd))
-   Update dependency com.google.cloud:google-cloud-trace to v2.3.3 ([#&#8203;2004](https://togithub.com/googleapis/java-spanner/issues/2004)) ([54f9095](https://togithub.com/googleapis/java-spanner/commit/54f90957544f0798d9872956dbe40ce822d5167d))

</details>

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Author: renovate-bot

pom.xml

@@ -62,7 +62,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-spanner-bom</artifactId>
-        <version>6.30.0</version>
+        <version>6.30.1</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>