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

Author: renovate[bot]

pom.xml

@@ -687,7 +687,7 @@ SPDX-License-Identifier: MIT
             <plugin>
                 <groupId>com.diffplug.spotless</groupId>
                 <artifactId>spotless-maven-plugin</artifactId>
-                <version>3.3.0</version>
+                <version>3.4.0</version>
                 <configuration>
                     <java>
                         <palantirJavaFormat>