deps: update dependency com.google.cloud:google-cloud-container-bom t…

…o v1.0.4 (#548)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.cloud:google-cloud-container-bom](https://togithub.com/googleapis/java-container) | patch | `1.0.3` -> `1.0.4` |

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### Release Notes

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

### [`v1.0.4`](https://togithub.com/googleapis/java-container/blob/master/CHANGELOG.md#&#8203;104-httpswwwgithubcomgoogleapisjava-containercomparev103v104-2020-04-20)

[Compare Source](https://togithub.com/googleapis/java-container/compare/v1.0.3...v1.0.4)

</details>

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pom.xml

@@ -284,7 +284,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-container-bom</artifactId>
-        <version>1.0.3</version>
+        <version>1.0.4</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>