chore(deps): update dependency com.google.cloud:google-cloud-workflow-executions to v2.0.3 (GoogleCloudPlatform#5912)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-workflow-executions](https://togithub.com/googleapis/java-workflow-executions) | `2.0.2` -> `2.0.3` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-workflow-executions/2.0.3/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-workflow-executions/2.0.3/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-workflow-executions/2.0.3/compatibility-slim/2.0.2)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-workflow-executions/2.0.3/confidence-slim/2.0.2)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>googleapis/java-workflow-executions</summary>

### [`v2.0.3`](https://togithub.com/googleapis/java-workflow-executions/blob/master/CHANGELOG.md#&#8203;203-httpswwwgithubcomgoogleapisjava-workflow-executionscomparev202v203-2021-09-01)

[Compare Source](https://togithub.com/googleapis/java-workflow-executions/compare/v2.0.2...v2.0.3)

</details>

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Author: renovate-bot

workflows/cloud-client/pom.xml

@@ -59,7 +59,7 @@ limitations under the License.
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-workflow-executions</artifactId>
-      <version>2.0.2</version>
+      <version>2.0.3</version>
     </dependency>
     <!-- [END workflows_api_quickstart_dependencies] -->