Package: handle Windows PathAlreadyExists error code

Unfortunately, error.AccessDenied is ambiguous on Windows when it is
returned from fs.rename.

src/Package.zig

@@ -570,7 +570,7 @@ fn renameTmpIntoCache(
                 };
                 continue;
             },
-            error.PathAlreadyExists => {
+            error.PathAlreadyExists, error.AccessDenied => {
                 // Package has been already downloaded and may already be in use on the system.
                 cache_dir.deleteTree(tmp_dir_sub_path) catch |del_err| {
                     std.log.warn("unable to delete temp directory: {s}", .{@errorName(del_err)});