Merge pull request #209 from bric3/renovate/nebula.release-21.x

chore(deps): update plugin nebula-release to v21

Author: bric3

gradle/libs.versions.toml

@@ -41,4 +41,4 @@ shadow = { id = "com.github.johnrengelman.shadow", version = "8.1.1" }
 versions = { id = "com.github.ben-manes.versions", version = "0.52.0" }
 license = { id = "com.github.hierynomus.license", version = "0.16.1" }
 gradle-extensions = { id = "com.github.vlsi.gradle-extensions", version = "1.90" }
-nebula-release = { id = "nebula.release", version = "20.2.0" }
+nebula-release = { id = "nebula.release", version = "21.0.0" }