deps: update dependency com.google.cloud:google-cloud-bigqueryconnection-bom to v1.0.15 (#1877)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-bigqueryconnection-bom](https://github.com/googleapis/java-bigqueryconnection) | `1.0.14` -> `1.0.15` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigqueryconnection-bom/1.0.15/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigqueryconnection-bom/1.0.15/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigqueryconnection-bom/1.0.15/compatibility-slim/1.0.14)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigqueryconnection-bom/1.0.15/confidence-slim/1.0.14)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v1.0.15`](https://github.com/googleapis/java-bigqueryconnection/blob/master/CHANGELOG.md#&#8203;1015-httpswwwgithubcomgoogleapisjava-bigqueryconnectioncomparev1014v1015-2021-04-24)

[Compare Source](https://github.com/googleapis/java-bigqueryconnection/compare/v1.0.14...v1.0.15)

</details>

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Author: renovate-bot

pom.xml

@@ -203,7 +203,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-bigqueryconnection-bom</artifactId>
-        <version>1.0.14</version>
+        <version>1.0.15</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>