Bump com.diffplug.spotless:spotless-plugin-gradle from 6.22.0 to 6.23…

….3 (#164)

Bumps [com.diffplug.spotless:spotless-plugin-gradle](https://github.com/diffplug/spotless) from 6.22.0 to 6.23.3.
- [Changelog](https://github.com/diffplug/spotless/blob/main/CHANGES.md)
- [Commits](diffplug/spotless@gradle/6.22.0...gradle/6.23.3)

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

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buildSrc/build.gradle

@@ -11,7 +11,7 @@ repositories {
 }
 
 dependencies {
-    implementation('com.diffplug.spotless:spotless-plugin-gradle:6.22.0') {
+    implementation('com.diffplug.spotless:spotless-plugin-gradle:6.23.3') {
         because('needed by plugin java-coding-conventions')
     }
 }