cleaup: Remove psycopg from Dockerfile (not needed, after all)

Author: natkam

examples/docker_compose/Dockerfile-DBInit

@@ -2,7 +2,7 @@ FROM postgres
 
 # Install git
 RUN apt-get update && \
-    apt-get install -y python3 python3-venv python3-psycopg2 && \
+    apt-get install -y python3 python3-venv && \
     apt-get clean && \
     rm -rf /var/lib/apt/lists/*