Fix JarContentTest by adding dependency on jar creating task

Otherwise tests could be run before the final jar was created and stored
to `build/libs`.

libraries/kotlinx-metadata/jvm/build.gradle.kts

@@ -68,6 +68,9 @@ tasks.register<ShadowJar>("shadowJar") {
     addArtifact("runtime", this, artifactRef)
 }
 
+val test by tasks
+test.dependsOn("shadowJar")
+
 sourcesJar {
     for (dependency in shadows.dependencies) {
         if (dependency is ProjectDependency) {