Update dependency com.diffplug.spotless:spotless-maven-plugin to v2.31.0
diff --git a/jgvariant-parent/pom.xml b/jgvariant-parent/pom.xml
index 22c9753..df79511 100644
--- a/jgvariant-parent/pom.xml
+++ b/jgvariant-parent/pom.xml
@@ -64,7 +64,7 @@
     <maven-javadoc-plugin.version>3.4.1</maven-javadoc-plugin.version>
     <maven-source-plugin.version>3.2.1</maven-source-plugin.version>
     <nexus-staging-plugin.version>1.6.13</nexus-staging-plugin.version>
-    <spotless-plugin.version>2.30.0</spotless-plugin.version>
+    <spotless-plugin.version>2.31.0</spotless-plugin.version>
     <surefire-plugin.version>3.0.0-M8</surefire-plugin.version>
     <versions-plugin.version>2.14.2</versions-plugin.version>