chore(deps): update dependency com.google.cloud:google-cloud-spanner to v6.40.1 (#2387)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-spanner](https://github.com/googleapis/java-spanner) | `6.40.0` -> `6.40.1` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner/6.40.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner/6.40.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner/6.40.1/compatibility-slim/6.40.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner/6.40.1/confidence-slim/6.40.0)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

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

### [`v6.40.1`](https://github.com/googleapis/java-spanner/blob/HEAD/CHANGELOG.md#&#8203;6401-httpsgithubcomgoogleapisjava-spannercomparev6400v6401-2023-04-17)

[Compare Source](https://github.com/googleapis/java-spanner/compare/v6.40.0...v6.40.1)

##### Dependencies

-   Update dependency com.google.cloud:google-cloud-monitoring to v3.16.0 ([#&#8203;2383](https://github.com/googleapis/java-spanner/issues/2383)) ([5d5c33a](https://github.com/googleapis/java-spanner/commit/5d5c33ae7c01e10112c72777f202187a50b55ac3))
-   Update dependency com.google.cloud:google-cloud-trace to v2.15.0 ([#&#8203;2384](https://github.com/googleapis/java-spanner/issues/2384)) ([6b4ce1f](https://github.com/googleapis/java-spanner/commit/6b4ce1fc7ffd837fab6250e36269589d95f5b8c6))

</details>

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README.md

@@ -42,7 +42,7 @@ If you are using Maven without the BOM, add this to your dependencies:
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-spanner</artifactId>
-  <version>6.40.0</version>
+  <version>6.40.1</version>
 </dependency>
 
 ```
@@ -57,13 +57,13 @@ implementation 'com.google.cloud:google-cloud-spanner'
 If you are using Gradle without BOM, add this to your dependencies:
 
 ```Groovy
-implementation 'com.google.cloud:google-cloud-spanner:6.40.0'
+implementation 'com.google.cloud:google-cloud-spanner:6.40.1'
 ```
 
 If you are using SBT, add this to your dependencies:
 
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-spanner" % "6.40.0"
+libraryDependencies += "com.google.cloud" % "google-cloud-spanner" % "6.40.1"
 ```
 <!-- {x-version-update-end} -->
 
@@ -411,7 +411,7 @@ Java is a registered trademark of Oracle and/or its affiliates.
 [kokoro-badge-link-5]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-spanner/java11.html
 [stability-image]: https://img.shields.io/badge/stability-stable-green
 [maven-version-image]: https://img.shields.io/maven-central/v/com.google.cloud/google-cloud-spanner.svg
-[maven-version-link]: https://central.sonatype.com/artifact/com.google.cloud/google-cloud-spanner/6.40.0
+[maven-version-link]: https://central.sonatype.com/artifact/com.google.cloud/google-cloud-spanner/6.40.1
 [authentication]: https://github.com/googleapis/google-cloud-java#authentication
 [auth-scopes]: https://developers.google.com/identity/protocols/oauth2/scopes
 [predefined-iam-roles]: https://cloud.google.com/iam/docs/understanding-roles#predefined_roles

samples/install-without-bom/pom.xml

@@ -32,7 +32,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-spanner</artifactId>
-      <version>6.40.0</version>
+      <version>6.40.1</version>
     </dependency>
     <!-- [END spanner_install_without_bom] -->