deps: update dependency com.google.cloud:google-cloud-spanner-bom to v6.42.0 (#5991)

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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) | `6.41.0` -> `6.42.0` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-bom/6.42.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-bom/6.42.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-bom/6.42.0/compatibility-slim/6.41.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-bom/6.42.0/confidence-slim/6.41.0)](https://docs.renovatebot.com/merge-confidence/) |

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### ⚠ Dependency Lookup Warnings ⚠

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### Release Notes

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

### [`v6.42.0`](https://togithub.com/googleapis/java-spanner/blob/HEAD/CHANGELOG.md#&#8203;6420-httpsgithubcomgoogleapisjava-spannercomparev6410v6420-2023-05-15)

[Compare Source](https://togithub.com/googleapis/java-spanner/compare/v6.41.0...v6.42.0)

##### Features

-   Add support for UpdateDatabase in Cloud Spanner ([#&#8203;2265](https://togithub.com/googleapis/java-spanner/issues/2265)) ([2ea06e7](https://togithub.com/googleapis/java-spanner/commit/2ea06e70a6f22635bcad7b7e4c79d0cf710dc6dc))
-   Add support for UpdateDatabase in Cloud Spanner ([#&#8203;2429](https://togithub.com/googleapis/java-spanner/issues/2429)) ([09f20bd](https://togithub.com/googleapis/java-spanner/commit/09f20bd43913a7a01985fd290964d134612c14eb))

##### Bug Fixes

-   Add error details for INTERNAL error ([#&#8203;2413](https://togithub.com/googleapis/java-spanner/issues/2413)) ([ed62aa6](https://togithub.com/googleapis/java-spanner/commit/ed62aa666ae34cf5e552e19b6b5dc2a8c6609e4e))
-   Use javax.annotation.Nonnull in executor framework ([#&#8203;2414](https://togithub.com/googleapis/java-spanner/issues/2414)) ([afcc598](https://togithub.com/googleapis/java-spanner/commit/afcc598e05c75610db8d0adacd4da79b4c124122))

##### Dependencies

-   Update dependency com.google.cloud:google-cloud-monitoring to v3.18.0 ([#&#8203;2426](https://togithub.com/googleapis/java-spanner/issues/2426)) ([05a45f8](https://togithub.com/googleapis/java-spanner/commit/05a45f81c2c71dd236fa36cc987e78a6aa31b594))
-   Update dependency com.google.cloud:google-cloud-shared-dependencies to v3.9.0 ([#&#8203;2427](https://togithub.com/googleapis/java-spanner/issues/2427)) ([42dbfe3](https://togithub.com/googleapis/java-spanner/commit/42dbfe3600b1d482d64c6c4f6865f88db399bae3))
-   Update dependency com.google.cloud:google-cloud-trace to v2.17.0 ([#&#8203;2428](https://togithub.com/googleapis/java-spanner/issues/2428)) ([6f7fee8](https://togithub.com/googleapis/java-spanner/commit/6f7fee81233811f5bc002f212c8972ffc6afbe16))
-   Update dependency org.graalvm.buildtools:junit-platform-native to v0.9.22 ([#&#8203;2423](https://togithub.com/googleapis/java-spanner/issues/2423)) ([679bb36](https://togithub.com/googleapis/java-spanner/commit/679bb366162575c28bab1df9b87d01517ea8d5aa))
-   Update dependency org.graalvm.buildtools:native-maven-plugin to v0.9.22 ([#&#8203;2424](https://togithub.com/googleapis/java-spanner/issues/2424)) ([a72f4ff](https://togithub.com/googleapis/java-spanner/commit/a72f4ff64cce2e9c746e8f6a9e107cbd72afa67f))
-   Update dependency org.graalvm.sdk:graal-sdk to v22.3.2 ([#&#8203;2391](https://togithub.com/googleapis/java-spanner/issues/2391)) ([c082a1f](https://togithub.com/googleapis/java-spanner/commit/c082a1fccb79cf4c001519eba4a75cef30150541))

</details>

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Author: renovate-bot

google-cloud-bom/pom.xml

@@ -238,7 +238,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-spanner-bom</artifactId>
-        <version>6.41.0</version>
+        <version>6.42.0</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>