Dependency updates (#82)

* deps(gradle): Upgrade the Plugin Publishing Plugin to version 2.0.0

See [1].

[1]: https://docs.gradle.org/9.1.0/release-notes.html#publishing-plugin-improvements

* deps: Upgrade Kotlin to version 2.2.21

Author: sschuberth

gradle/libs.versions.toml

@@ -2,8 +2,8 @@
 assertj = "3.27.6"
 git-semver-plugin = "0.16.1"
 jgit = "7.4.0.202509020913-r"
-kotlin = "2.2.0"
-plugin-publish = "1.3.1"
+kotlin = "2.2.21"
+plugin-publish = "2.0.0"
 slf4j = "2.0.17"
 
 [plugins]