Migrate from Ava test framework to node:test

test/yaml.ts

@@ -1,14 +1,18 @@
-import ava from "ava";
+import test from "node:test";
+import assert from "node:assert";
 import * as yaml from "yaml";
 import { stringify } from "../lib/common/yaml";
 
 import testCases from "./yaml-tests.json";
 
-ava("stringify", (t) => {
+void test("stringify", () => {
   for (const testCase of testCases) {
     let str = stringify(testCase);
     if (str.startsWith(">2")) str = ">3" + str.slice(2);
     if (str.startsWith("|2")) str = "|3" + str.slice(2);
-    t.deepEqual(yaml.parse(yaml.stringify(testCase)), yaml.parse(str));
+    assert.deepStrictEqual(
+      yaml.parse(yaml.stringify(testCase)),
+      yaml.parse(str),
+    );
   }
 });