chore(deps): update dependency com.google.cloud:google-cloud-bigtable to v2.18.1 (#1586)

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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) | `2.18.0` -> `2.18.1` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigtable/2.18.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigtable/2.18.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigtable/2.18.1/compatibility-slim/2.18.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigtable/2.18.1/confidence-slim/2.18.0)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.18.1`](https://togithub.com/googleapis/java-bigtable/blob/HEAD/CHANGELOG.md#&#8203;2181-httpsgithubcomgoogleapisjava-bigtablecomparev2180v2181-2023-01-17)

[Compare Source](https://togithub.com/googleapis/java-bigtable/compare/v2.18.0...v2.18.1)

##### Dependencies

-   Update dependency com.google.cloud:google-cloud-monitoring-bom to v3.9.0 ([#&#8203;1579](https://togithub.com/googleapis/java-bigtable/issues/1579)) ([70c0500](https://togithub.com/googleapis/java-bigtable/commit/70c050001379214d5577a896e280d04101891a08))

</details>

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README.md

@@ -41,7 +41,7 @@ If you are using Maven without BOM, add this to your dependencies:
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-bigtable</artifactId>
-  <version>2.18.0</version>
+  <version>2.18.1</version>
 </dependency>
 
 ```

samples/install-without-bom/pom.xml

@@ -29,7 +29,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-bigtable</artifactId>
-      <version>2.18.0</version>
+      <version>2.18.1</version>
     </dependency>
     <!-- [END bigtable_install_without_bom] -->