The packaging docs apparently discourage license.

Julian · Julian · commit 4f00eb0b9947 · 2024-02-25T22:53:05.000-05:00
They say to just use the classifier.
diff --git a/pyproject.toml b/pyproject.toml
@@ -10,7 +10,6 @@ name = "referencing"
 description = "JSON Referencing + Python"
 requires-python = ">=3.8"
 readme = "README.rst"
-license = {text = "MIT"}
 keywords = ["json", "referencing", "jsonschema", "openapi", "asyncapi"]
 authors = [
   { name = "Julian Berman", email = "Julian+referencing@GrayVines.com" },
