deps: update dependency com.google.cloud:google-cloud-pubsublite-parent to v1.5.3 (#134)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-pubsublite-parent](https://togithub.com/googleapis/java-shared-config) | `1.5.2` -> `1.5.3` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-pubsublite-parent/1.5.3/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-pubsublite-parent/1.5.3/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-pubsublite-parent/1.5.3/compatibility-slim/1.5.2)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-pubsublite-parent/1.5.3/confidence-slim/1.5.2)](https://docs.renovatebot.com/merge-confidence/) |

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pom.xml

@@ -5,7 +5,7 @@
     <parent>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-pubsublite-parent</artifactId>
-        <version>1.5.2</version>
+        <version>1.5.3</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <packaging>jar</packaging>