fix(deps): update dependency com.google.cloud:google-cloud-bigtable to v2.18.1 (GoogleCloudPlatform#7592)

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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) | `2.17.1` -> `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/2.17.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigtable/2.18.1/confidence-slim/2.17.1)](https://docs.renovatebot.com/merge-confidence/) |

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### ⚠ Dependency Lookup Warnings ⚠

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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 ([#&GoogleCloudPlatform#8203;1579](https://togithub.com/googleapis/java-bigtable/issues/1579)) ([70c0500](https://togithub.com/googleapis/java-bigtable/commit/70c050001379214d5577a896e280d04101891a08))

### [`v2.18.0`](https://togithub.com/googleapis/java-bigtable/blob/HEAD/CHANGELOG.md#&#8203;2180-httpsgithubcomgoogleapisjava-bigtablecomparev2171v2180-2023-01-12)

[Compare Source](https://togithub.com/googleapis/java-bigtable/compare/v2.17.1...v2.18.0)

##### Features

-   Enable channel priming by default ([#&GoogleCloudPlatform#8203;1555](https://togithub.com/googleapis/java-bigtable/issues/1555)) ([303959c](https://togithub.com/googleapis/java-bigtable/commit/303959cc88e8cf164a45026d79de67e3f58d09fe))

##### Bug Fixes

-   Call attemptStarted method with the request ([#&GoogleCloudPlatform#8203;1562](https://togithub.com/googleapis/java-bigtable/issues/1562)) ([325f09c](https://togithub.com/googleapis/java-bigtable/commit/325f09c9e257d53871a9071e6bfcbb0887298641))
-   Defer instance admin api errors to RPC time rather then client construction time ([#&GoogleCloudPlatform#8203;1576](https://togithub.com/googleapis/java-bigtable/issues/1576)) ([06a0ced](https://togithub.com/googleapis/java-bigtable/commit/06a0ced03dbac91145bac6d5d01f327c3ff4a83f))

##### Dependencies

-   Update dependency com.google.cloud:google-cloud-shared-dependencies to v3.1.1 ([#&GoogleCloudPlatform#8203;1572](https://togithub.com/googleapis/java-bigtable/issues/1572)) ([a68fb80](https://togithub.com/googleapis/java-bigtable/commit/a68fb8028a338b937b4baf8c50fad1080e137849))
-   Update dependency org.junit.vintage:junit-vintage-engine to v5.9.2 ([#&GoogleCloudPlatform#8203;1573](https://togithub.com/googleapis/java-bigtable/issues/1573)) ([e1362aa](https://togithub.com/googleapis/java-bigtable/commit/e1362aa4e47b2da089b21a8cfd124d7e935af8de))

</details>

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Author: renovate-bot

bigtable/beam/bulk-data-generator/pom.xml

@@ -71,7 +71,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-bigtable</artifactId>
-      <version>2.17.1</version>
+      <version>2.18.1</version>
     </dependency>
 
     <dependency>

bigtable/cassandra-migration-codelab/pom.xml

@@ -44,7 +44,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-bigtable</artifactId>
-      <version>2.17.1</version>
+      <version>2.18.1</version>
     </dependency>
 
     <dependency>

bigtable/hbase/snippets/pom.xml

@@ -45,7 +45,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-bigtable</artifactId>
-      <version>2.17.1</version>
+      <version>2.18.1</version>
     </dependency>
 
     <dependency>

bigtable/memorystore/pom.xml

@@ -44,7 +44,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-bigtable</artifactId>
-      <version>2.17.1</version>
+      <version>2.18.1</version>
     </dependency>
 
     <!-- https://mvnrepository.com/artifact/net.spy/spymemcached -->

bigtable/scheduled-backups/pom.xml

@@ -51,7 +51,7 @@ limitations under the License.
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-bigtable</artifactId>
-      <version>2.17.1</version>
+      <version>2.18.1</version>
     </dependency>
     <dependency>
       <groupId>com.fasterxml.jackson.core</groupId>