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

…datatransfer to v1.2.3 (#719)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-bigquerydatatransfer](https://togithub.com/googleapis/java-bigquerydatatransfer) | `1.2.2` -> `1.2.3` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigquerydatatransfer/1.2.3/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigquerydatatransfer/1.2.3/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigquerydatatransfer/1.2.3/compatibility-slim/1.2.2)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigquerydatatransfer/1.2.3/confidence-slim/1.2.2)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v1.2.3`](https://togithub.com/googleapis/java-bigquerydatatransfer/blob/master/CHANGELOG.md#&#8203;123-httpswwwgithubcomgoogleapisjava-bigquerydatatransfercomparev122v123-2021-03-22)

[Compare Source](https://togithub.com/googleapis/java-bigquerydatatransfer/compare/v1.2.2...v1.2.3)

</details>

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samples/install-without-bom/pom.xml

@@ -28,7 +28,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-bigquerydatatransfer</artifactId>
-      <version>1.2.2</version>
+      <version>1.2.3</version>
     </dependency>
     <!-- [END bigquerydatatransfer_install_without_bom] -->