Bump com.diffplug.spotless:spotless-maven-plugin from 2.39.0 to 2.40.0

Bumps [com.diffplug.spotless:spotless-maven-plugin](https://github.com/diffplug/spotless) from 2.39.0 to 2.40.0.
- [Changelog](https://github.com/diffplug/spotless/blob/main/CHANGES.md)
- [Commits](diffplug/spotless@lib/2.39.0...lib/2.40.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

pom.xml

@@ -248,7 +248,7 @@
     <taglist-maven-plugin.version>3.0.0</taglist-maven-plugin.version>
     <versions-maven-plugin.version>2.16.1</versions-maven-plugin.version>
     <sisu-maven-plugin.version>0.9.0.M2</sisu-maven-plugin.version>
-    <spotless-maven-plugin.version>2.39.0</spotless-maven-plugin.version>
+    <spotless-maven-plugin.version>2.40.0</spotless-maven-plugin.version>
     <project.build.outputTimestamp>2023-07-02T09:23:49Z</project.build.outputTimestamp>
     <!-- mono-module doesn't require site:stage for scm-publish -->
     <scmpublish.content>${project.reporting.outputDirectory}</scmpublish.content>