Remove tsconfig extending for @next/thrid-parties package (#53991)

x-ref:
https://github.com/vercel/next.js/actions/runs/5854800073/job/15871731468

Do not use the `packages/next` tsconfig, aligning tsconfig with other
`@next/` packages. So it won't run tsc with `tsec` plugin

packages/third-parties/tsconfig.json

@@ -1,7 +1,5 @@
 {
-  "extends": "../../tsconfig-tsec.json",
   "compilerOptions": {
-    "sourceMap": true,
     "strict": true,
     "esModuleInterop": true,
     "target": "es2019",