Migrate Gradle deprecations (#1745)

stdlib/stdlib.gradle.kts

@@ -24,8 +24,8 @@ plugins {
 
 // create and publish a self-contained stdlib archive
 // purpose is to provide non-jvm tools/projects with a versioned stdlib
-val stdlibZip by
-  tasks.registering(Zip::class) {
+val stdlibZip =
+  tasks.register<Zip>("stdlibZip") {
     destinationDirectory.set(layout.buildDirectory.dir("libs"))
     archiveBaseName.set("pkl-stdlib")
     archiveVersion.set(project.version as String)