Fix pyproject.toml license

Gets rid of the 'deprecated' warnings that pop up multiple
times during build/install

Author: tmi

pyproject.toml

@@ -21,7 +21,8 @@ readme = "README-wheel.md"
 authors = [
   {name="PyTorch Team", email="[email protected]"},
 ]
-license = {file = "LICENSE"}
+license = "BSD-2-Clause"
+license-files = ["LICENSE"]
 keywords = ["pytorch", "machine learning"]
 # PyPI package information.
 classifiers = [
@@ -33,7 +34,6 @@ classifiers = [
     "Intended Audience :: Developers",
     "Intended Audience :: Education",
     "Intended Audience :: Science/Research",
-    "License :: OSI Approved :: BSD License",
     "Topic :: Scientific/Engineering",
     "Topic :: Scientific/Engineering :: Mathematics",
     "Topic :: Scientific/Engineering :: Artificial Intelligence",