Fix apt step (bullseye repos, no archive hack)

Dockerfile

@@ -2,12 +2,8 @@
 # Built for a Hugging Face Docker Space (listens on 7860).
 FROM python:3.6-slim
 
-# Debian buster is archived — point apt at the archive so we can install the few system libs OpenCV needs.
-RUN set -eux; \
-    sed -i 's|deb.debian.org|archive.debian.org|g; s|security.debian.org|archive.debian.org|g; /buster-updates/d' /etc/apt/sources.list; \
-    apt-get -o Acquire::Check-Valid-Until=false update; \
-    apt-get install -y --no-install-recommends libglib2.0-0 libgl1-mesa-glx; \
-    rm -rf /var/lib/apt/lists/*
+# system lib OpenCV needs (base image is Debian bullseye — repos are live, no archive workaround)
+RUN apt-get update && apt-get install -y --no-install-recommends libglib2.0-0 && rm -rf /var/lib/apt/lists/*
 
 WORKDIR /app