Fix #214

[cschreib]

Increase floating point precision when converting to string to avoid confusing messages where non-equal floats are printed the same way.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.97%. Comparing base (e865d5d) to head (61a61b3).
⚠️ Report is 9 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #219   +/-   ##
=======================================
  Coverage   93.97%   93.97%           
=======================================
  Files          30       30           
  Lines        1775     1775           
=======================================
  Hits         1668     1668           
  Misses        107      107           

Files with missing lines	Coverage Δ
include/snitch/snitch_fixed_point.hpp	96.00% <ø> (ø)
src/snitch_append.cpp	94.11% <ø> (ø)

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