deps: update gax to v1.58.1 (#111)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.api:gax-grpc](https://togithub.com/googleapis/gax-java) | patch | `1.58.0` -> `1.58.1` |
| [com.google.api:gax-bom](https://togithub.com/googleapis/gax-java) | patch | `1.58.0` -> `1.58.1` |

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### Release Notes

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

### [`v1.58.1`](https://togithub.com/googleapis/gax-java/blob/master/CHANGELOG.md#&#8203;1581-httpswwwgithubcomgoogleapisgax-javacomparev1580v1581-2020-08-06)

[Compare Source](https://togithub.com/googleapis/gax-java/compare/v1.58.0...v1.58.1)

</details>

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pom.xml

@@ -56,7 +56,7 @@
     <site.installationModule>${project.artifactId}</site.installationModule>
 
     <grpc.version>1.31.0</grpc.version>
-    <gax.version>1.58.0</gax.version>
+    <gax.version>1.58.1</gax.version>
     <guava.version>29.0-android</guava.version>
     <protobuf.version>3.12.4</protobuf.version>
     <google.api-common.version>1.10.0</google.api-common.version>