deps: update dependency com.google.cloud:google-cloud-spanner-bom to v6.42.2 (#1237)

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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) | `6.42.0` -> `6.42.2` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-bom/6.42.2/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-bom/6.42.2/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-bom/6.42.2/compatibility-slim/6.42.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-bom/6.42.2/confidence-slim/6.42.0)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

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

### [`v6.42.2`](https://togithub.com/googleapis/java-spanner/blob/HEAD/CHANGELOG.md#&#8203;6422-httpsgithubcomgoogleapisjava-spannercomparev6421v6422-2023-05-30)

[Compare Source](https://togithub.com/googleapis/java-spanner/compare/v6.42.1...v6.42.2)

##### Dependencies

-   Update dependency com.google.cloud:google-cloud-monitoring to v3.19.0 ([#&#8203;2466](https://togithub.com/googleapis/java-spanner/issues/2466)) ([6de2cf6](https://togithub.com/googleapis/java-spanner/commit/6de2cf6a2d075b4347d69b9af21ac0cf96413884))
-   Update dependency com.google.cloud:google-cloud-shared-dependencies to v3.10.1 ([#&#8203;2465](https://togithub.com/googleapis/java-spanner/issues/2465)) ([0a89f49](https://togithub.com/googleapis/java-spanner/commit/0a89f49cd55311f4cb84a501aa302eab88b46575))
-   Update dependency com.google.cloud:google-cloud-trace to v2.18.0 ([#&#8203;2467](https://togithub.com/googleapis/java-spanner/issues/2467)) ([45609ed](https://togithub.com/googleapis/java-spanner/commit/45609ed65e49147077eaaf3eb90ab0c732eef80b))

### [`v6.42.1`](https://togithub.com/googleapis/java-spanner/blob/HEAD/CHANGELOG.md#&#8203;6421-httpsgithubcomgoogleapisjava-spannercomparev6420v6421-2023-05-22)

[Compare Source](https://togithub.com/googleapis/java-spanner/compare/v6.42.0...v6.42.1)

##### Dependencies

-   Update dependency commons-io:commons-io to v2.12.0 ([#&#8203;2439](https://togithub.com/googleapis/java-spanner/issues/2439)) ([d08b226](https://togithub.com/googleapis/java-spanner/commit/d08b226d5da6272b2de5f66ee1657d03268e396d))

</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>6.42.0</version>
+        <version>6.42.2</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>