Update dependency python to v3.10 (develop)

This MR contains the following updates:

Package	Type	Update	Change
python	image	minor	3.6 -> 3.10
python	final	minor	3.6 -> 3.10

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docs/Dockerfile

-FROM python:3.6
+FROM python:3.10
 
 RUN apt-get update && apt-get install -y graphviz
 RUN pip install sphinx livereload sphinx_rtd_theme django-environ django myst-parser sphinx-panels