deps: update dependency com.google.cloud:google-cloud-pubsub to v1.111.4 (#530)

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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) | `1.111.3` -> `1.111.4` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-pubsub/1.111.4/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-pubsub/1.111.4/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-pubsub/1.111.4/compatibility-slim/1.111.3)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-pubsub/1.111.4/confidence-slim/1.111.3)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v1.111.4`](https://togithub.com/googleapis/java-pubsub/blob/master/CHANGELOG.md#&#8203;11114-httpswwwgithubcomgoogleapisjava-pubsubcomparev11113v11114-2021-02-26)

[Compare Source](https://togithub.com/googleapis/java-pubsub/compare/v1.111.3...v1.111.4)

</details>

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Author: renovate-bot

samples/snapshot/pom.xml

@@ -51,7 +51,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-pubsub</artifactId>
-      <version>1.111.3</version>
+      <version>1.111.4</version>
     </dependency>
 
     <dependency>

samples/snippets/pom.xml

@@ -51,7 +51,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-pubsub</artifactId>
-      <version>1.111.3</version>
+      <version>1.111.4</version>
     </dependency>
     <!-- [END pubsublite_java_dependencies] -->
     <!-- [END pubsublite_install_without_bom] -->