fix pypi build

Author: Yiling-J

pyproject.toml

@@ -5,7 +5,7 @@ build-backend = "maturin"
 [project]
 name = "theine_core"
 requires-python = ">=3.7"
-license = "MIT"
+license = {text = "BSD-3-Clause"}
 classifiers = [
     "Programming Language :: Rust",
     "Programming Language :: Python :: Implementation :: CPython",