chore(deps): docker dependency upgrade

[github-actions]

Summary

Updates Dockerfile dependency pins using a no-pin apt probe and Copilot CLI.

Evidence

• Probe report artifact: docker-dependency-report.json
• Copilot session artifact: copilot-docker-dependency-session.md
• Build validation: handled by the repository Docker/CI workflows

Diff

diff --git a/Dockerfile b/Dockerfile
index e9c4266..2e41b1c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -53,7 +53,7 @@ RUN apt-get update && \
     jq=1.8.1-3ubuntu1.1 \
     zip=3.0-15ubuntu2 \
     unzip=6.0-28ubuntu7 \
-    nano=8.4-1 \
+    nano=8.4-1ubuntu0.1 \
     vim=2:9.1.0967-1ubuntu6.5 \
     python3.13=3.13.7-1ubuntu0.4 \
     python3.13-venv=3.13.7-1ubuntu0.4 \

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