Update dependency com.diffplug.spotless:spotless-maven-plugin to v2.3.1

Author: renovate-bot

pom.xml

@@ -37,7 +37,7 @@
         <maven.compiler.parameters>true</maven.compiler.parameters>
         <doma.version>2.41.0</doma.version>
         <quarkus.version>1.7.2.Final</quarkus.version>
-        <spotless-plugin.version>2.3.0</spotless-plugin.version>
+        <spotless-plugin.version>2.3.1</spotless-plugin.version>
         <google-java-format.version>1.7</google-java-format.version>
         <compiler-plugin.version>3.8.1</compiler-plugin.version>
         <source-plugin.version>3.2.1</source-plugin.version>