deps: update dependency com.google.http-client:google-http-client-bom to v1.34.2

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.http-client:google-http-client-bom](https://github.com/googleapis/google-http-java-client) | patch | `1.34.1` -> `1.34.2` |

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### Release Notes

<details>
<summary>googleapis/google-http-java-client</summary>

### [`v1.34.2`](https://github.com/googleapis/google-http-java-client/blob/master/CHANGELOG.md#&#8203;1342httpswwwgithubcomgoogleapisgoogle-http-java-clientcomparev1341v1342-2020-02-12)

[Compare Source](https://github.com/googleapis/google-http-java-client/compare/v1.34.1...v1.34.2)

</details>

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Author: renovate-bot

pom.xml

@@ -74,7 +74,7 @@
     <easymock.version>3.6</easymock.version>
     <objenesis.version>2.6</objenesis.version>
     <google.auth.version>0.20.0</google.auth.version>
-    <http-client-bom.version>1.34.1</http-client-bom.version>
+    <http-client-bom.version>1.34.2</http-client-bom.version>
     <protobuf.version>3.11.4</protobuf.version>
     <errorprone.version>2.3.4</errorprone.version>
   </properties>