!19 Upgrade to support OpenStack Yoga

From: @huangtianhua 
Reviewed-by: @ruebb, @han-guangyu 
Signed-off-by: @ruebb

python-attrs.spec

@@ -8,8 +8,8 @@ object protocols. \
 %bcond_with tests
 Name:           python-attrs
 Summary:        Python attributes without boilerplate
-Version:        20.3.0
-Release:        2
+Version:        21.4.0
+Release:        1
 License:        MIT
 URL:            http://www.attrs.org/
 Source0:        https://github.com/hynek/attrs/archive/%{version}/attrs-%{version}.tar.gz
@@ -57,6 +57,9 @@ PYTHONPATH=$RPM_BUILD_ROOT/%{python3_sitelib} py.test-3 -v
 %doc AUTHORS.rst README.rst
 
 %changelog
+* Mon Jul 18 2022 OpenStack_SIG <openstack@openeuler.org> - 21.4.0-1
+- Upgrade package to version 21.4.0
+
 * Tue May 24 2022 renhongxun <renhongxun@h-partners> - 20.3.0-2
 - fix changelog error