Upgrade dnt to fix wrong .npmignore file

Author: zyc9012

deno.json

@@ -18,5 +18,8 @@
   "compilerOptions": {
     "lib": ["dom", "dom.iterable", "deno.ns"]
   },
-  "lock": false
+  "lock": false,
+  "imports": {
+    "@deno/dnt": "jsr:@deno/dnt@^0.42.3"
+  }
 }

scripts/build_npm.ts

@@ -1,4 +1,4 @@
-import { build, emptyDir } from "https://deno.land/x/dnt@0.40.0/mod.ts";
+import { build, emptyDir } from "@deno/dnt";
 import { version } from "../version.ts";
 
 await emptyDir("./npm");