Bump com.diffplug.spotless:spotless-plugin-gradle from 6.18.0 to 6.19.0 (#616)

Bumps [com.diffplug.spotless:spotless-plugin-gradle](https://github.com/diffplug/spotless) from 6.18.0 to 6.19.0.
- [Changelog](https://github.com/diffplug/spotless/blob/main/CHANGES.md)
- [Commits](diffplug/spotless@gradle/6.18.0...gradle/6.19.0)

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

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

Author: dependabot[bot]

build.gradle

@@ -10,7 +10,7 @@ buildscript {
         classpath 'net.researchgate:gradle-release:3.0.2'
         classpath "com.github.ben-manes:gradle-versions-plugin:0.46.0"
         classpath "gradle.plugin.com.github.jengelman.gradle.plugins:shadow:7.0.0"
-        classpath "com.diffplug.spotless:spotless-plugin-gradle:6.18.0"
+        classpath "com.diffplug.spotless:spotless-plugin-gradle:6.19.0"
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }