Enable build for older versions of py-setuptools

--- pyproject.toml.orig	2026-03-17 12:26:32 UTC
+++ pyproject.toml
@@ -9,7 +9,6 @@ maintainers = [
     { name = "Philippe Ombredanne", email = "pombredanne@gmail.com" },
     { name = "SPDX group at the Linux Foundation and others" },
 ]
-license = "Apache-2.0"
 description = "SPDX parser and tools."
 readme = "README.md"
 classifiers = [
@@ -41,6 +40,9 @@ dynamic = ["version"]
     "xmltodict",
 ]
 dynamic = ["version"]
+
+[project.license]
+text = "Apache-2.0"
 
 [project.optional-dependencies]
 test = ["pyshacl", "pytest", "tzdata"]