chore(deps): update dependency com.google.cloud:google-cloud-bigtable…

… to v1.23.2 (#784)

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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) | `1.23.1` -> `1.23.2` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigtable/1.23.2/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigtable/1.23.2/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigtable/1.23.2/compatibility-slim/1.23.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigtable/1.23.2/confidence-slim/1.23.1)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v1.23.2`](https://togithub.com/googleapis/java-bigtable/blob/master/CHANGELOG.md#&#8203;1232-httpswwwgithubcomgoogleapisjava-bigtablecomparev1231v1232-2021-04-23)

[Compare Source](https://togithub.com/googleapis/java-bigtable/compare/v1.23.1...v1.23.2)

</details>

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samples/install-without-bom/pom.xml

@@ -29,7 +29,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-bigtable</artifactId>
-      <version>1.23.1</version>
+      <version>1.23.2</version>
     </dependency>
     <!-- [END bigtable_install_without_bom] -->