Update dependency rancher/cli to v2.8.0

Author: renovate-rancher[bot]

package/Dockerfile

@@ -166,7 +166,7 @@ RUN curl -sLf ${!TINI_URL} > /usr/bin/tini && \
 # Versions for UI, DASHBOARD and CLI will be the same as 2.6 until new releases are made to these
 ENV CATTLE_UI_VERSION 2.7.0-rc10
 ENV CATTLE_DASHBOARD_UI_VERSION v2.7.0-rc10
-ENV CATTLE_CLI_VERSION v2.7.0-rc1
+ENV CATTLE_CLI_VERSION v2.8.0
 
 # Base UI brand used as a fallback env setting (not user facing) to indicate this is a non-prime install
 ENV CATTLE_BASE_UI_BRAND=