Upgrade packaging tools first

Dockerfile

@@ -5,7 +5,8 @@ RUN export DEBIAN_FRONTEND=noninteractive && \
     apt-get -y install bash git curl libxml2 libxslt1.1 xz-utils && \
     rm -rf /var/lib/apt/lists/*
 
-RUN pip install -U flake8 pylint lxml ast-to-xml requests
+RUN pip install -U pip setuptools wheel && \
+    pip install -U flake8 pylint lxml ast-to-xml requests
 
 ARG SHELLCHECK_VERSION=0.8.0
 RUN mkdir -p /opt/shellcheck && \