fix(deps): update dependency com.google.cloud:google-cloud-bigquerydatatransfer-bom to v2.3.7 (#8252)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-bigquerydatatransfer-bom](https://togithub.com/googleapis/java-bigquerydatatransfer) | `2.3.7-SNAPSHOT` -> `2.3.7` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigquerydatatransfer-bom/2.3.7/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigquerydatatransfer-bom/2.3.7/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigquerydatatransfer-bom/2.3.7/compatibility-slim/2.3.7-SNAPSHOT)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigquerydatatransfer-bom/2.3.7/confidence-slim/2.3.7-SNAPSHOT)](https://docs.renovatebot.com/merge-confidence/) |

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Author: renovate-bot

google-cloud-gapic-bom/pom.xml

@@ -94,7 +94,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-bigquerydatatransfer-bom</artifactId>
-        <version>2.3.7-SNAPSHOT</version><!-- {x-version-update:google-cloud-bigquerydatatransfer:current} -->
+        <version>2.3.7</version><!-- {x-version-update:google-cloud-bigquerydatatransfer:current} -->
         <type>pom</type>
         <scope>import</scope>
       </dependency>