fix: upgrade linux-libc-dev to address CVE-2026-23411 (#28)

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Author: Copilot

.devcontainer/Dockerfile

@@ -7,5 +7,6 @@ RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
     python3-venv \
     python3-pip \
     sudo \
+    && apt-get -y upgrade linux-libc-dev \
     && apt-get clean \
     && rm -rf /var/lib/apt/lists/*