[build] Use Mill 1.1.1-6-480a23 (#5196)

It includes an important fix for propagating system properties to
ScalaTest when using the native image launcher.

This also required updating the unidoc invocation, I made the same
change that Mill made to their internal Unidoc.

Author: jackkoenig

build.mill

@@ -1,4 +1,4 @@
-//| mill-version: 1.0.6
+//| mill-version: 1.1.1-6-480a23
 //| mvnDeps:
 //| - com.lihaoyi::mill-contrib-jmh:$MILL_VERSION
 //| - com.47deg::github4s:0.33.3

release.mill

@@ -3,6 +3,7 @@ package build
 import mill._
 import mill.api.{BuildCtx, Result}
 import mill.javalib.SonatypeCentralPublishModule
+import mill.javalib.api.internal.ZincOp
 import mill.scalalib._
 import mill.scalalib.scalafmt._
 import mill.scalalib.publish._
@@ -201,18 +202,21 @@ trait Unipublish extends ChiselCrossModule with ChiselPublishModule with Mima {
       Seq("-d", javadocDir.toString) ++
       unidocSourceFiles().map(_.path.toString)
 
-    jvmWorker()
-      .worker()
-      .docJar(
+    val worker = jvmWorker().internalWorker()
+    worker.apply(
+      ZincOp.ScaladocJar(
         scalaVersion(),
         scalaOrganization(),
         scalaDocClasspath(),
         scalacPluginClasspath(),
-        None,
-        fullOptions
-      ) match {
-      case true  => Result.Success(PathRef(createJar(Task.dest / "out.jar", Seq(javadocDir))))
-      case false => Result.Failure("docJar generation failed")
+        scalaCompilerBridge(),
+        fullOptions,
+        workDir = Task.dest
+      ),
+      javaHome().map(_.path)
+    ) match {
+      case true  => PathRef(Task.dest)
+      case false => Task.fail("docJar generation failed")
     }
   }
 }