fix: Fixed stemmer include.

Author: ShogunPanda

src/tokenizer/index.ts

@@ -1,5 +1,4 @@
-import { stemmer } from "../../stemmer/lib/en.js";
-
+import { stemmer } from "@stemmer/en.js";
 import { replaceDiacritics } from "./diacritics.js";
 import * as ERRORS from "./errors.js";
 import type { Language } from "./languages.js";