chore: fix incorrect license field

Author: kukushking

pyproject.toml

@@ -5,7 +5,7 @@ description = "Pandas on AWS."
 authors = [{ name = "Amazon Web Services" }]
 requires-python = ">=3.9, <4.0"
 readme = "README.md"
-license = {text = "Apache-2.0"}
+license = "Apache-2.0"
 license-files = ["LICENSE.txt", "NOTICE.txt" ]
 keywords = [
     "pandas",