Merge pull request #487 from OWASP-Benchmark/dependabot/maven/com.diffplug.spotless-spotless-maven-plugin-3.9.0

Bump com.diffplug.spotless:spotless-maven-plugin from 3.8.0 to 3.9.0

Author: davewichers

pom.xml

@@ -1116,7 +1116,7 @@
             <plugin>
                 <groupId>com.diffplug.spotless</groupId>
                 <artifactId>spotless-maven-plugin</artifactId>
-                <version>3.8.0</version>
+                <version>3.9.0</version>
                 <configuration>
                     <!-- optional: limit format enforcement to just the files changed by this feature branch -->
                     <ratchetFrom>origin/master</ratchetFrom>