Bump com.google.cloud.functions:function-maven-plugin

Bumps [com.google.cloud.functions:function-maven-plugin](https://github.com/GoogleCloudPlatform/functions-framework-java) from 0.9.1 to 0.9.8.
- [Release notes](https://github.com/GoogleCloudPlatform/functions-framework-java/releases)
- [Commits](https://github.com/GoogleCloudPlatform/functions-framework-java/commits)

---
updated-dependencies:
- dependency-name: com.google.cloud.functions:function-maven-plugin
  dependency-version: 0.9.8
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]

spring-cloud-function-samples/function-sample-gcp-background/pom.xml

@@ -53,7 +53,7 @@
 			<plugin>
 				<groupId>com.google.cloud.functions</groupId>
 				<artifactId>function-maven-plugin</artifactId>
-				<version>0.9.1</version>
+				<version>0.9.8</version>
 				<configuration>
 					<functionTarget>org.springframework.cloud.function.adapter.gcp.GcfJarLauncher</functionTarget>
 					<port>8080</port>