Move apt-get upgrade to run right after apt-get update (#36)

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Co-authored-by: idvoretskyi <118459+idvoretskyi@users.noreply.github.com>

Author: Copilot

.devcontainer/Dockerfile

@@ -1,14 +1,13 @@
 FROM mcr.microsoft.com/devcontainers/base:ubuntu-24.04
 
 # hadolint ignore=DL3008
-RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
+RUN apt-get update && apt-get -y upgrade && export DEBIAN_FRONTEND=noninteractive \
     && apt-get -y install --no-install-recommends \
     python3 \
     python3-venv \
     python3-pip \
     sudo \
     vim-tiny \
-    && apt-get -y upgrade \
     && apt-get -y purge linux-libc-dev \
     && apt-get -y autoremove \
     && apt-get clean \