update Python in dockerfile tests
installing with Python 3.5 is starting to fail
MODIFY
tests/dockerfile/binder-dir/binder/Dockerfile
tests/dockerfile/binder-dir/binder/Dockerfile
-FROM python:3.5
+FROM python:3.10
RUN pip install --no-cache notebook

MODIFY
tests/dockerfile/simple/Dockerfile
tests/dockerfile/simple/Dockerfile
-FROM python:3.5
+FROM python:3.10
RUN pip install --no-cache notebook

update Python in dockerfile tests

installing with Python 3.5 is starting to fail