Fix os.write.outputStream with perms for Scala 3

Author: kiendang

os/src/ReadWriteOps.scala

@@ -30,8 +30,8 @@ object write {
     checker.value.onWrite(target)
     if (createFolders) makeDir.all(target / RelPath.up, perms)
     if (perms != null && !exists(target)) {
-      val permArray =
-        if (perms == null) Array[FileAttribute[PosixFilePermission]]()
+      val permArray: Array[FileAttribute[_]] =
+        if (perms == null) Array.empty
         else Array(PosixFilePermissions.asFileAttribute(perms.toSet()))
       java.nio.file.Files.createFile(target.toNIO, permArray: _*)
     }

os/test/src/ReadingWritingTests.scala

@@ -121,6 +121,19 @@ object ReadingWritingTests extends TestSuite {
           out.write('o')
           out.close()
 
+          os.read(wd / "New File.txt") ==> "Hello"
+        }
+      }
+      test("outputStreamWithPerms") {
+        test - prep { wd =>
+          val out = os.write.outputStream(wd / "New File.txt", perms = os.PermSet(420))
+          out.write('H')
+          out.write('e')
+          out.write('l')
+          out.write('l')
+          out.write('o')
+          out.close()
+
           os.read(wd / "New File.txt") ==> "Hello"
         }
       }