Bump com.gradle.plugin-publish (#553)

Bumps com.gradle.plugin-publish from 0.12.0 to 0.13.0.
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plugins/gradle/graphql-java-codegen-gradle-plugin/build.gradle

 plugins {
-    id "com.gradle.plugin-publish" version "0.12.0"
+    id "com.gradle.plugin-publish" version "0.13.0"
     id "java-gradle-plugin"
 }