chore(deps): update dependency com.google.cloud:google-cloud-bigtable to v2.6.2 (googleapis#1225)

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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) | `2.6.1` -> `2.6.2` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigtable/2.6.2/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigtable/2.6.2/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigtable/2.6.2/compatibility-slim/2.6.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigtable/2.6.2/confidence-slim/2.6.1)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.6.2`](https://togithub.com/googleapis/java-bigtable/blob/HEAD/CHANGELOG.md#&#8203;262-httpsgithubcomgoogleapisjava-bigtablecomparev261v262-2022-04-15)

[Compare Source](https://togithub.com/googleapis/java-bigtable/compare/v2.6.1...v2.6.2)

</details>

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java-bigtable/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>2.6.1</version>
+  <version>2.6.2</version>
 </dependency>
 
 ```
@@ -56,13 +56,13 @@ implementation 'com.google.cloud:google-cloud-bigtable'
 If you are using Gradle without BOM, add this to your dependencies
 
 ```Groovy
-implementation 'com.google.cloud:google-cloud-bigtable:2.6.1'
+implementation 'com.google.cloud:google-cloud-bigtable:2.6.2'
 ```
 
 If you are using SBT, add this to your dependencies
 
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-bigtable" % "2.6.1"
+libraryDependencies += "com.google.cloud" % "google-cloud-bigtable" % "2.6.2"
 ```
 
 ## Authentication

java-bigtable/samples/install-without-bom/pom.xml

@@ -29,7 +29,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-bigtable</artifactId>
-      <version>2.6.1</version>
+      <version>2.6.2</version>
     </dependency>
     <!-- [END bigtable_install_without_bom] -->