Fix Sonatype plugin for Dokka 2.1

sonatype/src/main/kotlin/com/bakdata/gradle/SonatypePlugin.kt

@@ -231,10 +231,12 @@ class SonatypePlugin : Plugin<Project> {
                     withJavadocJar()
                 }
 
-                project.tasks.matching { it.name == "dokkaJavadoc" }.all {
-                    val javadocTask: Task = this
-                    tasks.named<Jar>("javadocJar") {
-                        from(javadocTask)
+                afterEvaluate {
+                    project.tasks.matching { it.name == "dokkaGenerateJavadoc" }.all {
+                        val javadocTask: Task = this
+                        tasks.named<Jar>("javadocJar") {
+                            from(javadocTask)
+                        }
                     }
                 }
 
@@ -251,7 +253,9 @@ class SonatypePlugin : Plugin<Project> {
 
             tasks.register("sign") { dependsOn(tasks.withType<Sign>()) }
 
-            tasks.matching { it is AbstractPublishToMaven }.all { dependsOn(tasks.withType<Sign>()) }
+            afterEvaluate {
+                tasks.matching { it is AbstractPublishToMaven }.all { dependsOn(tasks.withType<Sign>()) }
+            }
         }
     }