convert GPLv3+ license to SPDX

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

oath-toolkit.spec

@@ -1,7 +1,8 @@
 Name:          oath-toolkit
 Version:       2.6.11
-Release:       5%{?dist}
-License:       GPLv3+
+Release:       6%{?dist}
+# Automatically converted from old format: GPLv3+ - review is highly recommended.
+License:       GPL-3.0-or-later
 Summary:       One-time password components
 BuildRequires: make
 BuildRequires: pam-devel
@@ -90,7 +91,8 @@ Documentation files for libpskc.
 
 %package -n oathtool
 Summary:  A command line tool for generating and validating OTPs
-License:  GPLv3+
+# Automatically converted from old format: GPLv3+ - review is highly recommended.
+License:  GPL-3.0-or-later
 # https://fedorahosted.org/fpc/ticket/174
 Provides: bundled(gnulib)
 
@@ -187,6 +189,9 @@ mkdir -p -m 0600 %{buildroot}%{_sysconfdir}/liboath
 %{_libdir}/security/pam_oath.so
 
 %changelog
+* Thu Jul  25 2024 Miroslav Suchý <msuchy@redhat.com> - 2.6.11-6
+- convert license to SPDX
+
 * Thu Jul 18 2024 Fedora Release Engineering <releng@fedoraproject.org> - 2.6.11-5
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_41_Mass_Rebuild