Bump org.ajoberstar.git-publish from 4.2.0 to 4.2.1

Bumps [org.ajoberstar.git-publish](https://github.com/ajoberstar/gradle-git-publish) from 4.2.0 to 4.2.1.
- [Release notes](https://github.com/ajoberstar/gradle-git-publish/releases)
- [Commits](ajoberstar/gradle-git-publish@4.2.0...4.2.1)

---
updated-dependencies:
- dependency-name: org.ajoberstar.git-publish
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

build.gradle

@@ -6,7 +6,7 @@ buildscript {
 
 plugins {
     id 'org.asciidoctor.jvm.convert' version '3.3.2'
-    id 'org.ajoberstar.git-publish'  version '4.2.0'
+    id 'org.ajoberstar.git-publish'  version '4.2.1'
 }
 
 // See gradle.properties for some dependency version settings