Update to Cbc_jll dep to fix Clp_jll compatibility with MUMPS

[iamed2]

Matches jump-dev/Clp.jl#133, we experienced a similar downgrade of Cbc_jll and are running into libdmumps.so: cannot open shared object file: No such file or directory

Closes #196

[odow]

I think this in the result of the package manager choosing a Pareto-optimal solution that isn't great. It should probably try to maximize the version of direct dependencies over downgrading a direct to upgrade a transitive.

[codecov]

Codecov Report

Merging #195 (e3c8c88) into master (1f234b8) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #195   +/-   ##
=======================================
  Coverage   57.81%   57.81%           
=======================================
  Files           3        3           
  Lines         512      512           
=======================================
  Hits          296      296           
  Misses        216      216           

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[odow]

Formatter seems unrelated. I'll address separately

[iamed2]

thanks!