Workbench: Force the Python packaging version.

An older version than the one in Debian is being required and the Debian
version is being uninstalled. Removing the Debian package will remove
gyp and npm. The Python uninstallation fails so let's try to force the
version in Debian instead.

workbench/Dockerfile

@@ -172,7 +172,9 @@ RUN apt-get update && \
 ENV PIPX_HOME /opt/pipx
 ENV PIPX_BIN_DIR /opt/pipx/bin
 # hadolint ignore=DL3013
-RUN python3 -m pip install --no-cache-dir --break-system-packages \
+RUN export PIP_CONSTRAINT=/tmp/constraint.txt && \
+    echo 'packaging==24.1' >> "$PIP_CONSTRAINT" && \
+    python3 -m pip install --no-cache-dir --break-system-packages \
         Glances \
         PyGObject \
         PyMySQL \