[release-monitoring] Use sphinx version from pip during build

The current version of sphinx available in Fedora 36 doesn't work with the new
version of Anitya. Let's use the newest from pip.

Signed-off-by: Michal Konečný <mkonecny@redhat.com>

roles/openshift-apps/release-monitoring/templates/buildconfig.yml

@@ -44,6 +44,8 @@ items:
                 python3-wtforms && \
             dnf autoremove -y && \
             dnf clean all -y
+        # Install newer version of sphinx than what is available in Fedora 36
+        RUN pip install sphinx
         RUN git clone https://github.com/fedora-infra/anitya.git && \
                 pushd anitya && \
 {% if env == 'staging' %}