bacpop-133 Add pycairo dependency

[EmmaLRussell]

This error was being logged in beebop_py container on startup:

/usr/local/lib/python3.10/site-packages/graph_tool/draw/cairo_draw.py:32: RuntimeWarning: Error importing cairo. Graph drawing will not work.
  warnings.warn(msg, RuntimeWarning)

The symptom of this in beebop is that for all projects, Network jobs are shown as failedm and Microreact jobs as deferred.

Here we fix up the dependencies required by graph_tool in the PopPUNK docker file.

[EmmaLRussell]

Closing this as now obsolete