graphics/py-webcolors: update to 24.8.0
Update to the latest version to fix dependant ports:
ERROR Missing dependencies:
jupyterlab~=4.0 jupyterlab-server<3,>=2.27.1 -> jupyter-server<3,>=1.21 -> jupyter-events>=0.9.0 -> jsonschema[format-nongpl]>=4.18.0 -> webcolors>=24.6.0
Approved by: portmgr (blanket)