Jinja2 Has Bug in MarkupSafe Dependency

[jrg94]

Describe the bug

Jinja2 uses MarkupSafe which recently removed one of its features. Apparently, Jinja2 still uses the feature but hasn't set an upper bound on their MarkupSafe dependency (or changed it's use). As a result, Glotter will fail to run due to the issue here:

aws/aws-sam-cli#3661

Note that AWS is completely unrelated. They just happened to run into the same issue.

Additional context

I have since changed the requirements.txt file in the Sample Programs repo to explicitly install an older version of MarkupSafe first. It seems to work, but it would be nice to have it patched here as well (though, obviously this is a Jinja2 problem at the end of the day).