Switch to SPDX expression for license in pyproject.toml (#10)

This matches the latest definition recommended in:
https://packaging.python.org/en/latest/guides/writing-pyproject-toml/#license

Author: tim-schilling

pyproject.toml

@@ -12,18 +12,18 @@ description = "A place to test things out"
 requires-python = ">=3.11"
 classifiers = [
     "Programming Language :: Python :: 3",
-    "License :: OSI Approved :: MIT License",
     "Operating System :: OS Independent",
 ]
 keywords = [
     "django",
     "django commons",
 ]
+license = "MIT"
 
 [tool.setuptools.dynamic]
 version = {attr = "django_commons_best_practices.__version__"}
 readme = {file = ["README.md"]}
 
 [project.urls]
 Homepage = "https://github.com/django-commons/best-practices"
-Issues = "https://github.com/django-commons/best-practices/issues"
+Issues = "https://github.com/django-commons/best-practices/issues"