deps(maven): bump com.diffplug.spotless:spotless-maven-plugin (#28)

Bumps [com.diffplug.spotless:spotless-maven-plugin](https://github.com/diffplug/spotless) from 3.6.0 to 3.7.0.
- [Release notes](https://github.com/diffplug/spotless/releases)
- [Changelog](https://github.com/diffplug/spotless/blob/main/CHANGES.md)
- [Commits](diffplug/spotless@maven/3.6.0...maven/3.7.0)

---
updated-dependencies:
- dependency-name: com.diffplug.spotless:spotless-maven-plugin
  dependency-version: 3.7.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]

pom.xml

@@ -62,7 +62,7 @@
         <version.plugin.failsafe>3.5.6</version.plugin.failsafe>
         <version.plugin.source>3.4.0</version.plugin.source>
         <version.plugin.javadoc>3.12.0</version.plugin.javadoc>
-        <version.plugin.spotless>3.6.0</version.plugin.spotless>
+        <version.plugin.spotless>3.7.0</version.plugin.spotless>
         <version.plugin.license>5.0.0</version.plugin.license>
         <version.plugin.invoker>3.10.1</version.plugin.invoker>
         <version.plugin.jmh>0.2.2</version.plugin.jmh>