Bump com.diffplug.spotless:spotless-maven-plugin (#22)

Bumps the dependencies group with 1 update in the / directory: [com.diffplug.spotless:spotless-maven-plugin](https://github.com/diffplug/spotless).


Updates `com.diffplug.spotless:spotless-maven-plugin` from 3.3.0 to 3.4.0
- [Release notes](https://github.com/diffplug/spotless/releases)
- [Changelog](https://github.com/diffplug/spotless/blob/main/CHANGES.md)
- [Commits](diffplug/spotless@lib/3.3.0...maven/3.4.0)

---
updated-dependencies:
- dependency-name: com.diffplug.spotless:spotless-maven-plugin
  dependency-version: 3.4.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: dependencies
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pom.xml

@@ -58,7 +58,7 @@
         <version.maven.plugin.gpg>3.2.8</version.maven.plugin.gpg>
         <version.maven.plugin.javadoc>3.12.0</version.maven.plugin.javadoc>
         <version.maven.plugin.source>3.4.0</version.maven.plugin.source>
-        <version.maven.plugin.spotless>3.3.0</version.maven.plugin.spotless>
+        <version.maven.plugin.spotless>3.4.0</version.maven.plugin.spotless>
 
         <version.slf4j>2.0.17</version.slf4j>
     </properties>