Update dependency com.diffplug.spotless:spotless-maven-plugin to v3.4.0

Author: renovate[bot]

pom.xml

@@ -21,7 +21,7 @@
 
         <jackson.version>2.21.1</jackson.version>
         <junit.version>6.1.0-M1</junit.version>
-        <spotless.version>3.3.0</spotless.version>
+        <spotless.version>3.4.0</spotless.version>
     </properties>
     <dependencies>
         <dependency>