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

…v1.1.18 (#1974)

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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) | `1.1.17` -> `1.1.18` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-billing-bom/1.1.18/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-billing-bom/1.1.18/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-billing-bom/1.1.18/compatibility-slim/1.1.17)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-billing-bom/1.1.18/confidence-slim/1.1.17)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v1.1.18`](https://github.com/googleapis/java-billing/blob/master/CHANGELOG.md#&#8203;1118-httpswwwgithubcomgoogleapisjava-billingcomparev1117v1118-2021-05-11)

[Compare Source](https://github.com/googleapis/java-billing/compare/v1.1.17...v1.1.18)

</details>

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pom.xml

@@ -231,7 +231,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-billing-bom</artifactId>
-        <version>1.1.17</version>
+        <version>1.1.18</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>