chore(deps): update dependency com.diffplug.spotless:spotless-maven-plugin to v3.1.0

Author: renovate[bot]

integration-tests/it-spring-boot-smoke-test/pom.xml

@@ -147,7 +147,7 @@
       <plugin>
         <groupId>com.diffplug.spotless</groupId>
         <artifactId>spotless-maven-plugin</artifactId>
-        <version>3.0.0</version>
+        <version>3.1.0</version>
         <configuration>
           <java>
             <googleJavaFormat/>

prometheus-metrics-parent/pom.xml

@@ -71,7 +71,7 @@
       <plugin>
         <groupId>com.diffplug.spotless</groupId>
         <artifactId>spotless-maven-plugin</artifactId>
-        <version>3.0.0</version>
+        <version>3.1.0</version>
         <configuration>
           <java>
             <googleJavaFormat/>