Fix support for symlinked directories

src/main/kotlin/link/infra/packwiz/installer/DownloadTask.kt

@@ -176,7 +176,10 @@ internal class DownloadTask private constructor(val metadata: IndexFile.File, de
 			}
 
 			if (fileSource.hashIsEqual(hash)) {
-				Files.createDirectories(destPath.parent)
+				// isDirectory follows symlinks, but createDirectories doesn't
+				if (Files.isDirectory(destPath.parent)) {
+					Files.createDirectories(destPath.parent)
+				}
 				Files.copy(data.inputStream(), destPath, StandardCopyOption.REPLACE_EXISTING)
 				data.clear()
 			} else {