[release-monitoring] Let's uninstall the package before installing it again

It seems that the package isn't replaced with the newer build, let's remove it
first and see if this will help.

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

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

@@ -69,6 +69,8 @@ items:
                 cp -r _build/html/* ../anitya/static/docs/ && \
                 popd && \
 {% if env == 'staging' %}
+                # Uninstall the existing anitya installation first
+                pip-3 uninstall anitya
                 # Move bootstrap to correct folder
                 rm -f anitya/static/bootstrap && \
                 mv anitya/static/bootstrap-3.3.4-fedora anitya/static/bootstrap && \