fix: Update .devcontainer/Dockerfile

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: Akanshu-2u

.devcontainer/Dockerfile

@@ -4,4 +4,5 @@ FROM mcr.microsoft.com/devcontainers/universal:latest
 
 RUN rm -f /etc/apt/sources.list.d/yarn.list \
         /etc/apt/sources.list.d/yarn*.list \
-&& apt-get update
+    && apt-get update \
+    && rm -rf /var/lib/apt/lists/*