Bump spotless-maven-plugin from 2.7.0 to 2.8.0

Bumps [spotless-maven-plugin](https://github.com/diffplug/project) from 2.7.0 to 2.8.0.
- [Release notes](https://github.com/diffplug/project/releases)
- [Commits](https://github.com/diffplug/project/commits)

Signed-off-by: dependabot[bot] <support@github.com>

pom.xml

@@ -293,7 +293,7 @@
             <plugin>
                 <groupId>com.diffplug.spotless</groupId>
                 <artifactId>spotless-maven-plugin</artifactId>
-                <version>2.7.0</version>
+                <version>2.8.0</version>
                 <configuration>
                     <java>
                         <excludes>