remove altair update in favour of >= pin in dockerfile

Author: trevorcampbell

Dockerfile

@@ -20,9 +20,6 @@ RUN pip install jupyter-book
 # Pinning pandas until altair 5.1.2 to avoid future warning https://github.com/altair-viz/altair/issues/3181
 RUN pip install numpy jinja2 pandas"<2.1" altair">=5.1.1" "vegafusion[embed]" vl-convert-python">=0.13" click ibis-framework ghp-import jupytext nodejs
 
-# Update altair to >= 5.1.1 get a png rendering in PDF build
-RUN pip install --upgrade altair
-
 # forces scikit-learn to grab latest to avoid bug in 1.3.0 related to checking for c-contiguity breaking figures in classification 2. See https://github.com/scikit-learn/scikit-learn/pull/26772
 # TODO: remove this once scikit-learn 1.4.x or beyond releases and is incorporated into jupyter/scipy-notebook
 RUN pip install -U git+https://github.com/scikit-learn/scikit-learn.git@main