Update dependency com.github.triplet.gradle:play-publisher to v3.12.1

Author: renovate[bot]

build.gradle

@@ -12,7 +12,7 @@ buildscript {
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
         classpath "org.jetbrains.kotlin:kotlin-test-junit:$kotlin_version"
         classpath 'com.google.gms:google-services:4.4.2'
-        classpath 'com.github.triplet.gradle:play-publisher:3.10.1'
+        classpath 'com.github.triplet.gradle:play-publisher:3.12.1'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files