deps: update dependency com.google.cloud:google-cloud-pubsublite-bom to v1.12.19 (#6320)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-pubsublite-bom](https://togithub.com/googleapis/java-pubsublite) ([source](https://togithub.com/googleapis/java-pubsub)) | `1.12.18` -> `1.12.19` | [![age](https://developer.mend.io/api/mc/badges/age/maven/com.google.cloud:google-cloud-pubsublite-bom/1.12.19?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/maven/com.google.cloud:google-cloud-pubsublite-bom/1.12.19?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/maven/com.google.cloud:google-cloud-pubsublite-bom/1.12.18/1.12.19?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/maven/com.google.cloud:google-cloud-pubsublite-bom/1.12.18/1.12.19?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

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Author: renovate-bot

google-cloud-bom/pom.xml

@@ -231,7 +231,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-pubsublite-bom</artifactId>
-        <version>1.12.18</version>
+        <version>1.12.19</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>