Bump com.gradle.plugin-publish (#1153)

Bumps com.gradle.plugin-publish from 1.1.0 to 1.2.0.

---
updated-dependencies:
- dependency-name: com.gradle.plugin-publish
  dependency-type: direct:production
  update-type: version-update:semver-minor
...
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plugins/gradle/graphql-java-codegen-gradle-plugin/build.gradle

 plugins {
-    id "com.gradle.plugin-publish" version "1.1.0"
+    id "com.gradle.plugin-publish" version "1.2.0"
     id "java-gradle-plugin"
 }