fix: replace libgl1-mesa-glx with libgl1 (removed in Debian Trixie)

Dockerfile

@@ -9,7 +9,7 @@ FROM python:3.11-slim
 # System libraries required by opencv-python-headless
 RUN apt-get update && apt-get install -y --no-install-recommends \
         libglib2.0-0 \
-        libgl1-mesa-glx \
+        libgl1 \
     && rm -rf /var/lib/apt/lists/*
 
 # HF Spaces runs containers as uid 1000 by default