chore(deps): update dependency com.google.cloud:google-cloud-billing …

…to v2.3.0 (#689)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-billing](https://togithub.com/googleapis/java-billing) | `2.2.1` -> `2.3.0` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-billing/2.3.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-billing/2.3.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-billing/2.3.0/compatibility-slim/2.2.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-billing/2.3.0/confidence-slim/2.2.1)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.3.0`](https://togithub.com/googleapis/java-billing/blob/HEAD/CHANGELOG.md#&#8203;230-httpsgithubcomgoogleapisjava-billingcomparev221v230-2022-07-01)

[Compare Source](https://togithub.com/googleapis/java-billing/compare/v2.2.1...v2.3.0)

##### Features

-   Enable REST transport for most of Java and Go clients ([#&#8203;670](https://togithub.com/googleapis/java-billing/issues/670)) ([6763c54](https://togithub.com/googleapis/java-billing/commit/6763c54d42f0e818909ec6a3b526c3f35b875d8c))

</details>

---

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java-billing/samples/install-without-bom/pom.xml

@@ -29,7 +29,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-billing</artifactId>
-      <version>2.2.1</version>
+      <version>2.3.0</version>
     </dependency>
     <!-- [END billing_install_without_bom] -->
 

java-billing/samples/snapshot/pom.xml

@@ -28,7 +28,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-billing</artifactId>
-      <version>2.2.1</version>
+      <version>2.3.0</version>
     </dependency>
 
     <dependency>