deps: update dependency com.google.flogger:flogger-system-backend to …

…v0.6 (#568)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.flogger:flogger-system-backend](https://togithub.com/google/flogger) | `0.5.1` -> `0.6` | [![age](https://badges.renovateapi.com/packages/maven/com.google.flogger:flogger-system-backend/0.6/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.flogger:flogger-system-backend/0.6/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.flogger:flogger-system-backend/0.6/compatibility-slim/0.5.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.flogger:flogger-system-backend/0.6/confidence-slim/0.5.1)](https://docs.renovatebot.com/merge-confidence/) |

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google-cloud-pubsublite/pom.xml

@@ -98,7 +98,7 @@
     <dependency>
       <groupId>com.google.flogger</groupId>
       <artifactId>flogger-system-backend</artifactId>
-      <version>0.5.1</version>
+      <version>0.6</version>
       <scope>runtime</scope>
     </dependency>