fix(test): use unsafeCleanup for tmp directory in npm test

The tmp.withDir cleanup was failing with ENOTEMPTY because the test
creates files inside the temp directory. Adding unsafeCleanup: true
allows recursive deletion of the directory contents.

Author: johnlindquist

src/api/npm.test.ts

@@ -63,4 +63,4 @@ await tmp.withDir(async (dir) => {
 
 		t.is(result, "Hello")
 	})
-})
+}, { unsafeCleanup: true })