deps: update dependency com.google.cloud:google-cloud-core to v1.93.5 (#177)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.cloud:google-cloud-core](https://github.com/googleapis/java-core) | patch | `1.93.4` -> `1.93.5` |

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### Release Notes

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

### [`v1.93.5`](https://github.com/googleapis/java-core/blob/master/CHANGELOG.md#&#8203;1935-httpswwwgithubcomgoogleapisjava-corecomparev1934v1935-2020-05-26)

[Compare Source](https://github.com/googleapis/java-core/compare/v1.93.4...v1.93.5)

</details>

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pom.xml

@@ -63,7 +63,7 @@
     <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
     <github.global.server>github</github.global.server>
     <site.installationModule>google-cloud-datalabeling-parent</site.installationModule>
-    <google.core.version>1.93.4</google.core.version>
+    <google.core.version>1.93.5</google.core.version>
     <google.api-common.version>1.9.2</google.api-common.version>
     <google.common-protos.version>1.18.0</google.common-protos.version>
     <gax.version>1.56.0</gax.version>