Bump com.diffplug.spotless:spotless-maven-plugin from 3.0.0 to 3.1.0

Bumps [com.diffplug.spotless:spotless-maven-plugin](https://github.com/diffplug/spotless) from 3.0.0 to 3.1.0.
- [Release notes](https://github.com/diffplug/spotless/releases)
- [Changelog](https://github.com/diffplug/spotless/blob/main/CHANGES.md)
- [Commits](diffplug/spotless@lib/3.0.0...lib/3.1.0)

---
updated-dependencies:
- dependency-name: com.diffplug.spotless:spotless-maven-plugin
  dependency-version: 3.1.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

pom.xml

@@ -29,7 +29,7 @@
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <build-alias>b000</build-alias>
     <wala.version>1.6.12</wala.version>
-    <spotless.version>3.0.0</spotless.version>
+    <spotless.version>3.1.0</spotless.version>
     <maven.surefire.version>3.5.4</maven.surefire.version>
     <parallel>both</parallel>
     <logging.config.file>./logging.properties</logging.config.file>