chore(deps): update dependency com.google.cloud:google-cloud-bigtable to v2.1.1 (GoogleCloudPlatform#5910)

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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) | `2.1.0` -> `2.1.1` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigtable/2.1.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigtable/2.1.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigtable/2.1.1/compatibility-slim/2.1.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigtable/2.1.1/confidence-slim/2.1.0)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.1.1`](https://togithub.com/googleapis/java-bigtable/blob/master/CHANGELOG.md#&#8203;211-httpswwwgithubcomgoogleapisjava-bigtablecomparev210v211-2021-09-01)

[Compare Source](https://togithub.com/googleapis/java-bigtable/compare/v2.1.0...v2.1.1)

</details>

---

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

@@ -71,7 +71,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-bigtable</artifactId>
-      <version>2.1.0</version>
+      <version>2.1.1</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>2.1.0</version>
+      <version>2.1.1</version>
     </dependency>
 
     <dependency>

bigtable/hbase/snippets/pom.xml

@@ -45,7 +45,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-bigtable</artifactId>
-      <version>2.1.0</version>
+      <version>2.1.1</version>
     </dependency>
 
     <dependency>

bigtable/memorystore/pom.xml

@@ -44,7 +44,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-bigtable</artifactId>
-      <version>2.1.0</version>
+      <version>2.1.1</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>2.1.0</version>
+      <version>2.1.1</version>
     </dependency>
     <dependency>
       <groupId>org.codehaus.jackson</groupId>