ReadTheDocs somehow caches requirements and insists in using old
version of Sphinx (1.8). We have to force using newer one (4.5)
Signed-off-by: Alexander Bokovoy <abokovoy@redhat.com>
Sphinx is extensible with plugins that can add new syntax, roles,
directives, domains, and more.
Signed-off-by: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>