deps: update dependency com.google.cloud:google-cloud-speech-bom to v…

…1.22.6 (#501)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.cloud:google-cloud-speech-bom](https://github.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://github.com/googleapis/java-speech/blob/master/CHANGELOG.md#&#8203;1226-httpswwwgithubcomgoogleapisjava-speechcomparev1225v1226-2020-04-07)

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

</details>

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pom.xml

@@ -545,7 +545,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-speech-bom</artifactId>
-        <version>1.22.5</version>
+        <version>1.22.6</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>