Update zinit download URL after repo rename (zinit -> zos_zinit)

packages/stats/Dockerfile fetched the zinit release binary from
threefoldtech/zinit, renamed to zos_zinit. Point it at the new name instead of
relying on GitHub's non-permanent rename redirect. (Docs/badge links to the old
name are cosmetic and left for a later bulk pass.)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: ashraffouda

packages/stats/Dockerfile

@@ -14,7 +14,7 @@ COPY --from=build /app/packages/stats/nginx /etc/nginx
 RUN mkdir -p /etc/zinit;
 COPY --from=build /app/packages/stats/zinit /etc/zinit
 
-RUN curl --location  https://github.com/threefoldtech/zinit/releases/download/v0.2.14/zinit -o /sbin/zinit && \
+RUN curl --location  https://github.com/threefoldtech/zos_zinit/releases/download/v0.2.14/zinit -o /sbin/zinit && \
     chmod +x /sbin/zinit
 RUN echo "* */6 * * * curl localhost/api/stats-update" >> /var/spool/cron/crontabs/root