chore(deps): update dependency com.google.cloud:google-cloud-speech to v1.24.8 (#377)

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This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.cloud:google-cloud-speech](https://togithub.com/googleapis/java-speech) | patch | `1.24.7` -> `1.24.8` |

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### Release Notes

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

### [`v1.24.8`](https://togithub.com/googleapis/java-speech/blob/master/CHANGELOG.md#&#8203;1248-httpswwwgithubcomgoogleapisjava-speechcomparev1247v1248-2020-12-02)

[Compare Source](https://togithub.com/googleapis/java-speech/compare/v1.24.7...v1.24.8)

</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>1.24.7</version>
+      <version>1.24.8</version>
     </dependency>
     <!-- [END speech_install_without_bom] -->
     <dependency>