Bump com.diffplug.spotless from 6.1.0 to 6.1.2

Bumps com.diffplug.spotless from 6.1.0 to 6.1.2.

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

Signed-off-by: dependabot[bot] <support@github.com>

build.gradle.kts

@@ -18,7 +18,7 @@ plugins {
     // // OpenAPI code generation
     // id("org.openapi.generator") version "4.3.1"
     // Code formatting
-    id("com.diffplug.spotless") version "6.1.0"
+    id("com.diffplug.spotless") version "6.1.2"
 }
 
 group = "com.faforever"