Bump com.gradle.plugin-publish from 0.21.0 to 1.2.1

Bumps com.gradle.plugin-publish from 0.21.0 to 1.2.1.

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

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

gradle-versions-plugin/build.gradle

@@ -2,7 +2,7 @@ plugins {
   id 'org.jetbrains.kotlin.jvm'
   id 'org.jetbrains.dokka'
   id 'org.jlleitschuh.gradle.ktlint'
-  id 'com.gradle.plugin-publish' version '0.21.0'
+  id 'com.gradle.plugin-publish' version '1.2.1'
   id 'maven-publish'
   id 'java-gradle-plugin'
   id 'java-library'