Remove redundant setuptools in pyproject.toml requires (#105303)

There are two `setuptools` require in requires. It was a typo in original PR: e85dfb6203 .

This PR just remove the redundant one.

Pull Request resolved: https://github.com/pytorch/pytorch/pull/105303
Approved by: https://github.com/mikaylagawarecki

pyproject.toml

@@ -6,7 +6,6 @@ requires = [
     "numpy",
     "ninja",
     "pyyaml",
-    "setuptools",
     "cmake",
     "typing-extensions",
     "requests",