deps: update dependency com.google.cloud:google-cloud-billing-bom to …

…v1.1.15 (#1719)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-billing-bom](https://github.com/googleapis/java-billing) | `1.1.14` -> `1.1.15` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-billing-bom/1.1.15/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-billing-bom/1.1.15/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-billing-bom/1.1.15/compatibility-slim/1.1.14)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-billing-bom/1.1.15/confidence-slim/1.1.14)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

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

### [`v1.1.15`](https://github.com/googleapis/java-billing/blob/master/CHANGELOG.md#&#8203;1115-httpswwwgithubcomgoogleapisjava-billingcomparev1114v1115-2021-03-11)

[Compare Source](https://github.com/googleapis/java-billing/compare/v1.1.14...v1.1.15)

</details>

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pom.xml

@@ -224,7 +224,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-billing-bom</artifactId>
-        <version>1.1.14</version>
+        <version>1.1.15</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>