Upgrade ruamel.yaml.clib to work with Python 3.10 (#8034)

ruamel.yaml.clib did not build with the upcoming Python 3.10.

Cf. https://sourceforge.net/p/ruamel-yaml-clib/tickets/5/

ruamel.yaml.clib==0.2.4 fixes the issue. It does not work
with Python 3.7 (cf https://sourceforge.net/p/ruamel-yaml-clib/tickets/6/)
but currently Kubespray requires Python >= 3.9.

requirements.txt

@@ -6,5 +6,5 @@ netaddr==0.7.19
 pbr==5.4.4
 jmespath==0.9.5
 ruamel.yaml==0.16.10
-ruamel.yaml.clib==0.2.2
+ruamel.yaml.clib==0.2.4
 MarkupSafe==1.1.1