Remove Python version classifiers from pyproject.toml (#219)

Removed specific Python version classifiers from the project metadata as
they are no longer recommended by pypi.

Signed-off-by: Justin Chu <justinchuby@users.noreply.github.com>

Author: justinchuby

pyproject.toml

@@ -15,11 +15,6 @@ license = "Apache-2.0"
 license-files = ["LICEN[CS]E*"]
 classifiers = [
   "Development Status :: 4 - Beta",
-  "Programming Language :: Python :: 3.9",
-  "Programming Language :: Python :: 3.10",
-  "Programming Language :: Python :: 3.11",
-  "Programming Language :: Python :: 3.12",
-  "Programming Language :: Python :: 3.13",
 ]
 dependencies = ["numpy", "onnx>=1.16", "typing_extensions>=4.10", "ml_dtypes>=0.5.0"]