convert license to SPDX

This is part of https://fedoraproject.org/wiki/Changes/SPDX_Licenses_Phase_4

python-tinycss2.spec

@@ -7,10 +7,11 @@
 
 Name:           python-%{srcname}
 Version:        1.3.0
-Release:        3%{?dist}
+Release:        4%{?dist}
 Summary:        Low-level CSS parser for Python
 
-License:        BSD
+# Automatically converted from old format: BSD - review is highly recommended.
+License:        LicenseRef-Callaway-BSD
 URL:            https://pypi.python.org/pypi/%{srcname}/
 Source0:        %pypi_source
 
@@ -71,6 +72,9 @@ rm -rf %{buildroot}%{python3_sitelib}/%{srcname}/__pycache__/test.*.py?
 
 
 %changelog
+* Wed Sep 04 2024 Miroslav Suchý <msuchy@redhat.com> - 1.3.0-4
+- convert license to SPDX
+
 * Fri Jul 19 2024 Fedora Release Engineering <releng@fedoraproject.org> - 1.3.0-3
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_41_Mass_Rebuild