WIP: Update MFEM

[white238]

[codecov-commenter]

Codecov Report

Merging #783 (4ba1477) into develop (5554814) will decrease coverage by 0.01%. The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #783      +/-   ##
===========================================
- Coverage    94.91%   94.90%   -0.02%     
===========================================
  Files          142      142              
  Lines         9172     9151      -21     
===========================================
- Hits          8706     8685      -21     
  Misses         466      466              

Impacted Files	Coverage Δ
src/serac/infrastructure/about.cpp	26.86% <ø> (+0.39%)	:arrow_up:
src/serac/infrastructure/logger.cpp	95.23% <ø> (ø)
src/serac/numerics/expr_template_impl.hpp	100.00% <100.00%> (ø)
src/serac/numerics/functional/functional_qoi.inl	96.82% <100.00%> (ø)
...rac/numerics/functional/tests/functional_basic.cpp	100.00% <100.00%> (ø)
...rics/functional/tests/functional_boundary_test.cpp	84.53% <100.00%> (ø)
...erics/functional/tests/functional_multiphysics.cpp	100.00% <100.00%> (ø)
...numerics/functional/tests/functional_nonlinear.cpp	100.00% <100.00%> (ø)
src/serac/numerics/odes.cpp	82.70% <100.00%> (ø)
src/serac/numerics/tests/expr_templates.cpp	98.53% <100.00%> (ø)
... and 24 more

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[white238]

This is now ready to be reviewed.

[jamiebramwell]

Looks good! Thanks!