Bump spotless-plugin-gradle from 5.12.2 to 5.12.4

Bumps [spotless-plugin-gradle](https://github.com/diffplug/project) from 5.12.2 to 5.12.4.
- [Release notes](https://github.com/diffplug/project/releases)
- [Commits](https://github.com/diffplug/project/commits)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

build.gradle

@@ -4,7 +4,7 @@ buildscript {
   }
   dependencies {
     classpath 'com.cinnober.gradle:semver-git:2.5.0'
-    classpath 'com.diffplug.spotless:spotless-plugin-gradle:5.12.2'
+    classpath 'com.diffplug.spotless:spotless-plugin-gradle:5.12.4'
     classpath 'io.github.cosmicsilence:gradle-scalafix:0.1.8'
   }
 }