build(deps): Bump spotless-maven-plugin from 2.19.2 to 2.20.0

Bumps [spotless-maven-plugin](https://github.com/diffplug/spotless) from 2.19.2 to 2.20.0.
- [Release notes](https://github.com/diffplug/spotless/releases)
- [Changelog](https://github.com/diffplug/spotless/blob/main/CHANGES.md)
- [Commits](diffplug/spotless@lib/2.19.2...lib/2.20.0)

---
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] <[email protected]>

pom.xml

@@ -57,7 +57,7 @@
     <plugin.version.jacoco>0.8.7</plugin.version.jacoco>
     <plugin.version.javadoc>3.3.1</plugin.version.javadoc>
     <plugin.version.maven-enforcer>3.0.0</plugin.version.maven-enforcer>
-    <plugin.version.spotless>2.19.2</plugin.version.spotless>
+    <plugin.version.spotless>2.20.0</plugin.version.spotless>
     <plugin.version.surefire>3.0.0-M5</plugin.version.surefire>
 
     <version.java>11</version.java>