Bump com.gradle.plugin-publish from 1.2.1 to 1.2.2 (#281)

Bumps com.gradle.plugin-publish from 1.2.1 to 1.2.2.

---
updated-dependencies:
- dependency-name: com.gradle.plugin-publish
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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plugin/build.gradle

@@ -1,5 +1,5 @@
 plugins {
-  id "com.gradle.plugin-publish" version "1.2.1"
+  id "com.gradle.plugin-publish" version "1.2.2"
   id "java-gradle-plugin"
 }