deps: update dependency com.google.cloud:google-cloud-shared-dependen…

…cies to v0.8.4 (googleapis#206)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.cloud:google-cloud-shared-dependencies](https://togithub.com/googleapis/java-shared-dependencies) | patch | `0.8.2` -> `0.8.4` |

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### Release Notes

<details>
<summary>googleapis/java-shared-dependencies</summary>

### [`v0.8.4`](https://togithub.com/googleapis/java-shared-dependencies/blob/master/CHANGELOG.md#&#8203;084-httpswwwgithubcomgoogleapisjava-shared-dependenciescomparev083v084-2020-08-04)

[Compare Source](https://togithub.com/googleapis/java-shared-dependencies/compare/v0.8.3...v0.8.4)

### [`v0.8.3`](https://togithub.com/googleapis/java-shared-dependencies/blob/master/CHANGELOG.md#&#8203;083-httpswwwgithubcomgoogleapisjava-shared-dependenciescomparev082v083-2020-07-09)

[Compare Source](https://togithub.com/googleapis/java-shared-dependencies/compare/v0.8.2...v0.8.3)

</details>

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java-resourcemanager/pom.xml

@@ -75,7 +75,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-shared-dependencies</artifactId>
-        <version>0.8.2</version>
+        <version>0.8.4</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>