Bump com.github.kt3k.coveralls from 2.8.2 to 2.12.0

Bumps com.github.kt3k.coveralls from 2.8.2 to 2.12.0.

---
updated-dependencies:
- dependency-name: com.github.kt3k.coveralls
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

build.gradle

@@ -22,7 +22,7 @@ plugins {
     id 'signing'
     id 'nebula.release' version '15.2.0'
     id 'jacoco'
-    id 'com.github.kt3k.coveralls' version '2.8.2'
+    id 'com.github.kt3k.coveralls' version '2.12.0'
     id "io.github.gradle-nexus.publish-plugin" version "1.1.0"
 }