Enable build for older versions of py-setuptools.

--- pyproject.toml.orig	2026-01-20 09:51:18 UTC
+++ pyproject.toml
@@ -4,7 +4,6 @@ name = "django-post_office"
 
 [project]
 name = "django-post_office"
-license = "MIT"
 requires-python = ">=3.9"
 authors = [{name = "Selwin Ong", email = "selwin.ong@gmail.com"}]
 description = "A Django app to monitor and send mail asynchronously, complete with template support."
@@ -38,6 +37,9 @@ dynamic = ["version"]
     "django>=4.2",
 ]
 dynamic = ["version"]
+
+[project.license]
+text = "MIT"
 
 [project.readme]
 file = "README.md"