pyproject: Remove deprecated elements

Author: jepler

pyproject.toml

@@ -29,14 +29,12 @@ keywords = [
     "arbitraryprecision",
     "math",
 ]
-license = {text = "MIT"}
+license = "MIT"
 classifiers = [
     "Intended Audience :: Developers",
     "Topic :: Software Development :: Libraries",
     "Topic :: Software Development :: Embedded Systems",
     "Topic :: System :: Hardware",
-    "License :: OSI Approved :: MIT License",
-    "License :: OSI Approved :: Python Software Foundation License",
     "Programming Language :: Python :: 3",
 ]
 dynamic = ["version", "dependencies", "optional-dependencies"]