deps: update dependency com.google.flogger:flogger-system-backend to v0.8 (#1528)

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Author: renovate-bot

google-cloud-pubsublite/pom.xml

@@ -110,7 +110,7 @@
  <dependency>
  <groupId>com.google.flogger</groupId>
  <artifactId>flogger-system-backend</artifactId>
- <version>0.7.4</version>
+ <version>0.8</version>
  <scope>runtime</scope>
  </dependency>