Bump flogger.version from 0.7.4 to 0.8

Bumps `flogger.version` from 0.7.4 to 0.8.

Updates `com.google.flogger:flogger` from 0.7.4 to 0.8
- [Release notes](https://github.com/google/flogger/releases)
- [Commits](google/flogger@flogger-0.7.4...flogger-0.8)

Updates `com.google.flogger:google-extensions` from 0.7.4 to 0.8
- [Release notes](https://github.com/google/flogger/releases)
- [Commits](google/flogger@flogger-0.7.4...flogger-0.8)

Updates `com.google.flogger:flogger-system-backend` from 0.7.4 to 0.8
- [Release notes](https://github.com/google/flogger/releases)
- [Commits](google/flogger@flogger-0.7.4...flogger-0.8)

---
updated-dependencies:
- dependency-name: com.google.flogger:flogger
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: com.google.flogger:google-extensions
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: com.google.flogger:flogger-system-backend
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

pom.xml

@@ -27,7 +27,7 @@
   <properties>
     <beam.version>2.41.0</beam.version>
     <cloud-libraries-bom.version>25.1.0</cloud-libraries-bom.version>
-    <flogger.version>0.7.4</flogger.version>
+    <flogger.version>0.8</flogger.version>
     <guava.version>31.1-jre</guava.version>
     <jsonassert.version>1.5.1</jsonassert.version>
     <junit.version>4.13.2</junit.version>