Bump com.diffplug.spotless:spotless-maven-plugin from 2.39.0 to 2.40.0 (#481)

Author: dependabot[bot]

pom.xml

@@ -124,7 +124,7 @@
     <mockito.version>5.5.0</mockito.version>
     <spotbugs-annotations.version>4.7.3</spotbugs-annotations.version>
     <spotbugs-maven-plugin.version>4.7.3.6</spotbugs-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>
     <stapler-maven-plugin.version>175.vff879c6738b_6</stapler-maven-plugin.version>
   </properties>