Forward Mosek log to stdout

[aszekMosek]

The documentation for Model.solve() says

log_fn (path_like, optional) – Path of the logging file which is written out during the process. The default None results in the no log file, hence all solver outputs are piped to the python repl.

This change makes the Mosek behavior consistent with the second part of the description, that is The default None results in ... all solver outputs are piped to the python repl. Currently in Mosek if log_fn is None then nothing gets printed.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 86.70%. Comparing base (07aa9f6) to head (4e85880).
Report is 6 commits behind head on master.

Files	Patch %	Lines
linopy/solvers.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #305      +/-   ##
==========================================
- Coverage   89.72%   86.70%   -3.02%     
==========================================
  Files          16       16              
  Lines        4037     4038       +1     
  Branches      942      943       +1     
==========================================
- Hits         3622     3501     -121     
- Misses        282      413     +131     
+ Partials      133      124       -9     

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