chore(deps): update dependency com.google.cloud:google-cloud-bigtable to v2.40.0 (#2278)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-bigtable](https://togithub.com/googleapis/java-bigtable) | `2.39.5` -> `2.40.0` | [![age](https://developer.mend.io/api/mc/badges/age/maven/com.google.cloud:google-cloud-bigtable/2.40.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/maven/com.google.cloud:google-cloud-bigtable/2.40.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/maven/com.google.cloud:google-cloud-bigtable/2.39.5/2.40.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/maven/com.google.cloud:google-cloud-bigtable/2.39.5/2.40.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>googleapis/java-bigtable (com.google.cloud:google-cloud-bigtable)</summary>

### [`v2.40.0`](https://togithub.com/googleapis/java-bigtable/blob/HEAD/CHANGELOG.md#2400-2024-06-28)

[Compare Source](https://togithub.com/googleapis/java-bigtable/compare/v2.39.5...v2.40.0)

##### Features

-   Add String type with Utf8Raw encoding to Bigtable API ([#&#8203;2191](https://togithub.com/googleapis/java-bigtable/issues/2191)) ([e7f03fc](https://togithub.com/googleapis/java-bigtable/commit/e7f03fc7d252a7ff6c76a8e6e0a9e6ad3dcbd9d5))

##### Bug Fixes

-   Add getServiceName() to EnhancedBigTableStubSettings ([#&#8203;2256](https://togithub.com/googleapis/java-bigtable/issues/2256)) ([da703db](https://togithub.com/googleapis/java-bigtable/commit/da703db25f6702b263dbd8ded0cb0fd3422efe31))
-   Remove grpclb ([#&#8203;2033](https://togithub.com/googleapis/java-bigtable/issues/2033)) ([7355375](https://togithub.com/googleapis/java-bigtable/commit/735537571a147bfdd2a986664ff7905c8f5dc3db))

##### Dependencies

-   Update dependency com.google.truth.extensions:truth-proto-extension to v1.4.3 ([#&#8203;2268](https://togithub.com/googleapis/java-bigtable/issues/2268)) ([4573220](https://togithub.com/googleapis/java-bigtable/commit/45732201880a13eeced3d0332bd172aae0f73dbe))
-   Update dependency org.junit.vintage:junit-vintage-engine to v5.10.3 ([#&#8203;2269](https://togithub.com/googleapis/java-bigtable/issues/2269)) ([69fef96](https://togithub.com/googleapis/java-bigtable/commit/69fef968937f4d2e4cc479279a09d7b0bed6c5a2))
-   Update shared dependencies ([#&#8203;2265](https://togithub.com/googleapis/java-bigtable/issues/2265)) ([61014ca](https://togithub.com/googleapis/java-bigtable/commit/61014ca89318743cf0cc0bae97a7f875bc5243ab))

</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-bigtable</artifactId>
-  <version>2.39.5</version>
+  <version>2.40.0</version>
 </dependency>
 
 ```

samples/install-without-bom/pom.xml

@@ -29,7 +29,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-bigtable</artifactId>
-      <version>2.39.5</version>
+      <version>2.40.0</version>
     </dependency>
     <!-- [END bigtable_install_without_bom] -->