updates markdown package

[owocki]

updates markdown package to fix the wiki

[codecov]

Codecov Report

Merging #6186 into master will not change coverage by %.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #6186   +/-   ##
=======================================
  Coverage   28.52%   28.52%           
=======================================
  Files         277      277           
  Lines       24889    24889           
  Branches     3640     3640           
=======================================
  Hits         7100     7100           
- Misses      17508    17512    +4     
+ Partials      281      277    -4     

Impacted Files	Coverage Δ
app/dashboard/views.py	11.85% <0.00%> (ø)
...rketing/management/commands/no_applicants_email.py	0.00% <0.00%> (ø)
...eting/management/commands/assemble_leaderboards.py	40.48% <0.00%> (ø)

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