Merge pull request #1375 from kubernetes-client/dependabot/maven/com.diffplug.spotless-spotless-maven-plugin-2.6.0

Bump spotless-maven-plugin from 2.5.0 to 2.6.0

Author: k8s-ci-robot

pom.xml

@@ -419,7 +419,7 @@
       <plugin>
         <groupId>com.diffplug.spotless</groupId>
         <artifactId>spotless-maven-plugin</artifactId>
-        <version>2.5.0</version>
+        <version>2.6.0</version>
         <configuration>
           <formats>
             <format>