Update package manifest reading in tests

tests/unit/package-scripts.test.ts

@@ -1,4 +1,5 @@
 import { readFileSync } from "node:fs";
+import { resolve } from "node:path";
 
 import { describe, expect, it } from "vitest";
 
@@ -7,7 +8,7 @@ interface PackageManifest {
 }
 
 function readPackageManifest(): PackageManifest {
-  return JSON.parse(readFileSync(new URL("../../package.json", import.meta.url), "utf8")) as PackageManifest;
+  return JSON.parse(readFileSync(resolve(process.cwd(), "package.json"), "utf8")) as PackageManifest;
 }
 
 describe("package scripts", () => {