Update dependency com.diffplug.spotless:spotless-maven-plugin to v2.40.0

Author: renovate[bot]

pom.xml

@@ -59,7 +59,7 @@
     <skuzzle-imports-enforcer.version>2.4.0</skuzzle-imports-enforcer.version>
     <nexus-staging-maven-plugin.version>1.6.13</nexus-staging-maven-plugin.version>
     <flatten-maven-plugin.version>1.5.0</flatten-maven-plugin.version>
-    <spotless-maven-plugin.version>2.39.0</spotless-maven-plugin.version>
+    <spotless-maven-plugin.version>2.40.0</spotless-maven-plugin.version>
     <versions-maven-plugin.version>2.16.1</versions-maven-plugin.version>
   </properties>