update Dockerfile to newer python version

Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.11-slim
+FROM python:3.12-slim-trixie
 
 # Set a working directory
 WORKDIR /app
@@ -11,9 +11,6 @@ ENV PYTHONDONTWRITEBYTECODE=1 \
 
 # Install system deps
 RUN apt-get update && apt-get install -y --no-install-recommends \
-    build-essential \
-    gcc \
-    libffi-dev \
     && rm -rf /var/lib/apt/lists/*
 
 # Create a non-root user