deps: update dependency com.google.cloud:google-cloud-logging to v2.1.5 (#340)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-logging](https://togithub.com/googleapis/java-logging) | `2.1.3` -> `2.1.5` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-logging/2.1.5/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-logging/2.1.5/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-logging/2.1.5/compatibility-slim/2.1.3)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-logging/2.1.5/confidence-slim/2.1.3)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.1.5`](https://togithub.com/googleapis/java-logging/blob/master/CHANGELOG.md#&#8203;215-httpswwwgithubcomgoogleapisjava-loggingcomparev214v215-2021-02-25)

[Compare Source](https://togithub.com/googleapis/java-logging/compare/v2.1.3...v2.1.5)

</details>

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pom.xml

@@ -17,7 +17,7 @@
     <logback.version>1.2.3</logback.version>
     <easymock.version>3.6</easymock.version>
     <truth.version>1.1.2</truth.version>
-    <logging.version>2.1.3</logging.version>
+    <logging.version>2.1.5</logging.version>
     <slf4j.version>1.7.30</slf4j.version>
     <google.api-common.version>1.10.1</google.api-common.version>
   </properties>