Update ghcr.io/astral-sh/uv Docker tag to v0.8

Author: renovate[bot]

Dockerfile

@@ -26,4 +26,4 @@ RUN /root/terminal-config/ensure-user-terminal-config.sh && \
 
 # Install uv using the official image
 # See https://docs.astral.sh/uv/guides/integration/docker/#installing-uv
-COPY --from=ghcr.io/astral-sh/uv:0.7 /uv /uvx /bin/
+COPY --from=ghcr.io/astral-sh/uv:0.8 /uv /uvx /bin/