chore(deps): update dependency com.google.cloud:google-cloud-workflows to v2.1.5 (#392)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-workflows](https://togithub.com/googleapis/java-workflows) | `2.1.4` -> `2.1.5` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-workflows/2.1.5/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-workflows/2.1.5/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-workflows/2.1.5/compatibility-slim/2.1.4)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-workflows/2.1.5/confidence-slim/2.1.4)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.1.5`](https://togithub.com/googleapis/java-workflows/blob/HEAD/CHANGELOG.md#&#8203;215-httpswwwgithubcomgoogleapisjava-workflowscomparev214v215-2022-01-07)

[Compare Source](https://togithub.com/googleapis/java-workflows/compare/v2.1.4...v2.1.5)

</details>

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java-workflows/README.md

@@ -19,7 +19,7 @@ If you are using Maven, add this to your pom.xml file:
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-workflows</artifactId>
-  <version>2.1.4</version>
+  <version>2.1.5</version>
 </dependency>
 
 ```

java-workflows/samples/install-without-bom/pom.xml

@@ -29,7 +29,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-workflows</artifactId>
-      <version>2.1.4</version>
+      <version>2.1.5</version>
     </dependency>
     <!-- [END workflows_install_without_bom] -->
 

java-workflows/samples/snippets/pom.xml

@@ -28,7 +28,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-workflows</artifactId>
-      <version>2.1.4</version>
+      <version>2.1.5</version>
     </dependency>
 
     <dependency>