convert GPLv3+ license to SPDX

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

vmod-querystring.spec

@@ -2,10 +2,11 @@
 
 Name:           vmod-querystring
 Version:        2.0.3
-Release:        7%{?dist}
+Release:        8%{?dist}
 Summary:        QueryString module for Varnish Cache
 URL:            https://github.com/dridi/libvmod-querystring
-License:        GPLv3+
+# Automatically converted from old format: GPLv3+ - review is highly recommended.
+License:        GPL-3.0-or-later
 
 Source:         %{url}/releases/download/v%{version}/%{name}-%{version}.tar.gz
 
@@ -59,6 +60,9 @@ rm %{buildroot}%{vmoddir}/*.la
 
 
 %changelog
+* Thu Jul 25 2024 Miroslav Suchý <msuchy@redhat.com> - 2.0.3-8
+- convert license to SPDX
+
 * Sat Jul 20 2024 Fedora Release Engineering <releng@fedoraproject.org> - 2.0.3-7
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_41_Mass_Rebuild