📌(agents) unpin OpenSSL and related dependencies

The base image now includes OpenSSL 3.5.5, which resolves
CVE-2025-15467.

Remove explicit pinning of OpenSSL and its dependencies.

src/agents/Dockerfile

@@ -4,8 +4,6 @@ FROM python:3.13-slim AS base
 RUN apt-get update && apt-get install -y \
     libglib2.0-0 \
     libgobject-2.0-0 \
-    "openssl=3.5.4-1~deb13u2" \
-    "libssl3t64=3.5.4-1~deb13u2" \
     && rm -rf /var/lib/apt/lists/*
 
 FROM base AS builder