chore: bump io.github.ascopes:protobuf-maven-plugin from 3.8.1 to 3.9.0 (#2114)

Bumps [io.github.ascopes:protobuf-maven-plugin](https://github.com/ascopes/protobuf-maven-plugin) from 3.8.1 to 3.9.0.
- [Release notes](https://github.com/ascopes/protobuf-maven-plugin/releases)
- [Commits](ascopes/protobuf-maven-plugin@v3.8.1...v3.9.0)

---
updated-dependencies:
- dependency-name: io.github.ascopes:protobuf-maven-plugin
  dependency-version: 3.9.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]

examples/powertools-examples-kafka/pom.xml

@@ -141,7 +141,7 @@
             <plugin>
                 <groupId>io.github.ascopes</groupId>
                 <artifactId>protobuf-maven-plugin</artifactId>
-                <version>3.8.1</version>
+                <version>3.9.0</version>
                 <executions>
                     <execution>
                         <goals>

powertools-kafka/pom.xml

@@ -181,7 +181,7 @@
             <plugin>
                 <groupId>io.github.ascopes</groupId>
                 <artifactId>protobuf-maven-plugin</artifactId>
-                <version>3.8.1</version>
+                <version>3.9.0</version>
                 <executions>
                     <execution>
                         <id>generate-test-sources</id>