Fix warnings on license in pyproject.toml

Author: daskol

pyproject.toml

@@ -5,7 +5,7 @@ build-backend = "setuptools.build_meta"
 [project]
 name = "mpl-typst"
 description = "Typst backend for matplotlib (Python visualization library)."
-license = {text = "MIT"}
+license = "MIT"
 authors = [
     {name = "Daniel Bershatsky", email = "daniel.bershatsky@gmail.com"},
 ]
@@ -19,7 +19,6 @@ classifiers = [
     "Intended Audience :: End Users/Desktop",
     "Intended Audience :: Information Technology",
     "Intended Audience :: Science/Research",
-    "License :: OSI Approved :: MIT License",
     "Natural Language :: English",
     "Operating System :: OS Independent",
     "Programming Language :: Python",