chore(deps): update dependency com.google.cloud:google-cloud-speech to v1.22.6 (#138)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.cloud:google-cloud-speech](https://togithub.com/googleapis/java-speech) | patch | `1.22.5` -> `1.22.6` |

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### Release Notes

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

### [`v1.22.6`](https://togithub.com/googleapis/java-speech/blob/master/CHANGELOG.md#&#8203;1226-httpswwwgithubcomgoogleapisjava-speechcomparev1225v1226-2020-04-07)

[Compare Source](https://togithub.com/googleapis/java-speech/compare/v1.22.5...v1.22.6)

</details>

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samples/install-without-bom/pom.xml

@@ -29,7 +29,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-speech</artifactId>
-      <version>1.22.5</version>
+      <version>1.22.6</version>
     </dependency>
     <!-- [END google-cloud-speech_install_without_bom] -->
 

samples/snapshot/pom.xml

@@ -28,7 +28,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-speech</artifactId>
-      <version>1.22.5</version>
+      <version>1.22.6</version>
     </dependency>
 
     <dependency>