deps: update dependency com.google.cloud:google-cloud-billingbudgets-…

…bom to v0.2.4 (#547)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.cloud:google-cloud-billingbudgets-bom](https://togithub.com/googleapis/java-billingbudgets) | patch | `0.2.3` -> `0.2.4` |

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### Release Notes

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

### [`v0.2.4`](https://togithub.com/googleapis/java-billingbudgets/blob/master/CHANGELOG.md#&#8203;024-httpswwwgithubcomgoogleapisjava-billingbudgetscomparev023v024-2020-04-20)

[Compare Source](https://togithub.com/googleapis/java-billingbudgets/compare/v0.2.3...v0.2.4)

</details>

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pom.xml

@@ -265,7 +265,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-billingbudgets-bom</artifactId>
-        <version>0.2.3</version>
+        <version>0.2.4</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>