chore(deps): update dependency com.google.cloud:google-cloud-pubsub to v1.115.2 (#992)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-pubsub](https://togithub.com/googleapis/java-pubsub) | `1.115.1` -> `1.115.2` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-pubsub/1.115.2/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-pubsub/1.115.2/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-pubsub/1.115.2/compatibility-slim/1.115.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-pubsub/1.115.2/confidence-slim/1.115.1)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v1.115.2`](https://togithub.com/googleapis/java-pubsub/blob/HEAD/CHANGELOG.md#&#8203;11152-httpsgithubcomgoogleapisjava-pubsubcomparev11151v11152-2022-02-03)

[Compare Source](https://togithub.com/googleapis/java-pubsub/compare/v1.115.1...v1.115.2)

</details>

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README.md

@@ -43,7 +43,7 @@ If you are using Maven without BOM, add this to your dependencies:
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-pubsub</artifactId>
-  <version>1.115.1</version>
+  <version>1.115.2</version>
 </dependency>
 
 ```

samples/install-without-bom/pom.xml

@@ -44,7 +44,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-pubsub</artifactId>
-      <version>1.115.1</version>
+      <version>1.115.2</version>
     </dependency>
     <!-- [END pubsub_install_without_bom] -->