[BE] Update python versions for black formatter config (pytorch#99827)

Update black config to currently supported python versions in PyTorch
Pull Request resolved: pytorch#99827
Approved by: https://github.com/ezyang

Author: Skylion007

pyproject.toml

@@ -18,4 +18,4 @@ build-backend = "setuptools.build_meta:__legacy__"
 [tool.black]
 # Uncomment if pyproject.toml worked fine to ensure consistency with flake8
 # line-length = 120
-target-version = ["py37", "py38", "py39", "py310"]
+target-version = ["py38", "py39", "py310", "py311"]