Upgrade deb image to Stretch

[mbeacom]

Description

The goal of this PR is to upgrade our web image to extend from the stretch python image tag versus jessie. Additionally, this PR upgrades some of our pinned python packages.

Checklist

• linter status: 100% pass
• changes don't break existing behavior
• commit message follows commit guidelines

Testing

Built image and tested general functionality locally.

[codecov]

Codecov Report

Merging #888 into master will increase coverage by 0.84%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #888      +/-   ##
==========================================
+ Coverage   32.81%   33.65%   +0.84%     
==========================================
  Files         100       99       -1     
  Lines        6613     6034     -579     
  Branches      809      721      -88     
==========================================
- Hits         2170     2031     -139     
+ Misses       4336     3912     -424     
+ Partials      107       91      -16

Impacted Files	Coverage Δ
app/app/utils.py	19.58% <0%> (-3.35%)	⬇️
app/dashboard/admin.py	68.62% <0%> (-3.31%)	⬇️
app/dashboard/notifications.py	14.45% <0%> (-2.01%)	⬇️
app/app/settings.py	81.37% <0%> (-1.29%)	⬇️
...eting/management/commands/assemble_leaderboards.py	52.45% <0%> (-0.82%)	⬇️
app/gitcoinbot/actions.py	64.23% <0%> (-0.43%)	⬇️
...eting/management/commands/expiration_start_work.py	79.62% <0%> (-0.38%)	⬇️
app/marketing/views.py	11.65% <0%> (-0.08%)	⬇️
app/tdi/views.py	19.07% <0%> (-0.03%)	⬇️
app/dashboard/embed.py	6.77% <0%> (-0.03%)	⬇️
... and 17 more

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[owocki]

LGTM if you feel like it's well tested

[thelostone-mc]

@mbeacom Thoughts on shifting to django-bootstrap4 ?

It's mentioned in bootstrap3 change log

[mbeacom]

I'd love to... but I didn't want to make any major changes to the python packages in this PR. The main thing here is the upgrade from jessie to stretch for LTS and upgraded system packages like OpenSSL jumping to 1.1

We can definitely raise a PR following this to upgrade to django-bootstrap4 - Thanks for looking out @thelostone-mc 😛 - If no one has objections, we could try it in this PR. Looking to merge this following #668

[thelostone-mc]

Let's give it a shot post #668 merge :D

[mbeacom]

We can probably just rip out django-bootstrap3 since it's unused throughout the codebase.

[thelostone-mc]

:D