fix: add ca-certificates and libssl-dev to fix OpenSSL TLS errors

yfinance curl calls failed with OPENSSL_internal:invalid library in
python:3.12-slim. Adding ca-certificates, libssl-dev and curl ensures
the OpenSSL libraries are available at runtime.

Dockerfile

@@ -3,7 +3,7 @@ FROM python:3.12-slim AS base
 WORKDIR /app
 
 RUN apt-get update && \
-    apt-get install -y --no-install-recommends gcc g++ && \
+    apt-get install -y --no-install-recommends gcc g++ ca-certificates libssl-dev curl && \
     rm -rf /var/lib/apt/lists/*
 
 COPY pyproject.toml ./