Try fix Windows CI

Author: liufengyun

compiler/test/dotty/tools/io/ZipArchiveTest.scala

@@ -69,7 +69,6 @@ class ZipArchiveTest {
   private def manifestAt(location: URI): URL = classLoader(location).getResource("META-INF/MANIFEST.MF")
 
 
-  // ZipArchive.fromManifestURL(URL)
   @Test def `manifest resources just works`(): Unit = {
     val jar = createTestJar()
     val archive = new ManifestResources(manifestAt(jar.toUri))
@@ -79,23 +78,26 @@ class ZipArchiveTest {
       val f = it.next()
       assertFalse(it.hasNext)
       assertEquals("foo.class", f.name)
-    }
-    finally {
+    } finally {
       archive.close()
       Files.delete(jar)
     }
   }
 
-  private def createTestJar(): Path = Files.createTempFile("junit", ".jar").tap { f =>
+  private def createTestJar(): JPath = {
+    val f = Files.createTempFile("junit", ".jar")
     val man = new Manifest()
     man.getMainAttributes().put(Attributes.Name.MANIFEST_VERSION, "1.0")
     man.getEntries().put("foo.class", new Attributes(0))
-    Using.resource(new JarOutputStream(Files.newOutputStream(f), man)) { jout =>
+    val jout = new JarOutputStream(Files.newOutputStream(f), man)
+    try {
       jout.putNextEntry(new JarEntry("foo.class"))
       val bytes = "hello, world".getBytes
       jout.write(bytes, 0, bytes.length)
-      ()
+    } finally {
+      jout.close()
     }
+    f
   }
 
   private def createTestZip(): Path = Files.createTempFile("junit", ".zip").tap { f =>