bump lower compat bound of TimerOutputs.jl to v0.5.7

[ranocha]

This came out of #1771. Since the other PR will take some time, let's extract this part here. We use features introduced in v0.5.7 of TimerOutputs.jl.

[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3d899bc) 96.24% compared to head (a30e854) 96.24%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1772   +/-   ##
=======================================
  Coverage   96.24%   96.24%           
=======================================
  Files         431      431           
  Lines       34896    34896           
=======================================
  Hits        33583    33583           
  Misses       1313     1313           

Flag	Coverage Δ
unittests	96.24% <ø> (ø)

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[sloede]

LGTM, thanks!