chore(deps): update dependency com.google.cloud:google-cloud-speech to v2.6.0 (googleapis#973)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-speech](https://togithub.com/googleapis/java-speech) | `2.5.9` -> `2.6.0` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-speech/2.6.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-speech/2.6.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-speech/2.6.0/compatibility-slim/2.5.9)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-speech/2.6.0/confidence-slim/2.5.9)](https://docs.renovatebot.com/merge-confidence/) |

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Author: renovate-bot

java-speech/README.md

@@ -47,7 +47,7 @@ If you are using Maven without BOM, add this to your dependencies:
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-speech</artifactId>
-  <version>2.5.9</version>
+  <version>2.6.0</version>
 </dependency>
 
 ```
@@ -62,13 +62,13 @@ implementation 'com.google.cloud:google-cloud-speech'
 If you are using Gradle without BOM, add this to your dependencies:
 
 ```Groovy
-implementation 'com.google.cloud:google-cloud-speech:2.5.9'
+implementation 'com.google.cloud:google-cloud-speech:2.6.0'
 ```
 
 If you are using SBT, add this to your dependencies:
 
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-speech" % "2.5.9"
+libraryDependencies += "com.google.cloud" % "google-cloud-speech" % "2.6.0"
 ```
 
 ## Authentication

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

@@ -29,7 +29,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-speech</artifactId>
-      <version>2.5.9</version>
+      <version>2.6.0</version>
     </dependency>
     <!-- [END speech_install_without_bom] -->
     <dependency>