Merge pull request #215 from Yubico/dependabot/gradle/com.diffplug.sp…

…otless-spotless-plugin-gradle-6.9.0

Bump spotless-plugin-gradle from 6.8.0 to 6.9.0

build.gradle

@@ -4,7 +4,7 @@ buildscript {
   }
   dependencies {
     classpath 'com.cinnober.gradle:semver-git:2.5.0'
-    classpath 'com.diffplug.spotless:spotless-plugin-gradle:6.8.0'
+    classpath 'com.diffplug.spotless:spotless-plugin-gradle:6.9.0'
     classpath 'io.github.cosmicsilence:gradle-scalafix:0.1.13'
   }
 }