Use the SPDX license name in setup.py as required by PEP-639

Reference: https://peps.python.org/pep-0639/

Signed-off-by: Aurélien Bompard <[email protected]>

Author: abompard

setup.py

@@ -290,7 +290,7 @@ def gssapi_modules(lst):
     description='Python GSSAPI Wrapper',
     long_description=long_desc,
     long_description_content_type='text/x-rst',
-    license='LICENSE.txt',
+    license='ISC',
     url="https://github.com/pythongssapi/python-gssapi",
     python_requires=">=3.9",
     classifiers=[