Bump spotless-maven-plugin from 2.22.5 to 2.22.6

Bumps [spotless-maven-plugin](https://github.com/diffplug/spotless) from 2.22.5 to 2.22.6.
- [Release notes](https://github.com/diffplug/spotless/releases)
- [Changelog](https://github.com/diffplug/spotless/blob/main/CHANGES.md)
- [Commits](diffplug/spotless@maven/2.22.5...maven/2.22.6)

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

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

pom.xml

@@ -63,7 +63,7 @@
                     <plugin>
                        <groupId>com.diffplug.spotless</groupId>
                        <artifactId>spotless-maven-plugin</artifactId>
-                       <version>2.22.5</version>
+                       <version>2.22.6</version>
                        <configuration>
                            <!-- define a language-specific format -->
                            <java>