update pytest

[keiyamamo]

Fix #72
Also I added a test for mpirun.

[keiyamamo]

With this fix, tests hit 94% of laplace.py (it’s missing one line that should raise an error with unsupported extrapolation_sub_type)

--------- coverage: platform darwin, python 3.10.10-final-0 ----------
Name                                    Stmts   Miss  Cover
-----------------------------------------------------------
turtleFSI/__init__.py                       1      0   100%
turtleFSI/modules/__init__.py               1      0   100%
turtleFSI/modules/biharmonic.py            14      0   100%
turtleFSI/modules/common.py               111     69    38%
turtleFSI/modules/domain.py                49     25    49%
turtleFSI/modules/elastic.py               12      0   100%
turtleFSI/modules/fluid.py                 20      0   100%
turtleFSI/modules/laplace.py               16      1    94%
turtleFSI/modules/newtonsolver.py          52      2    96%
turtleFSI/modules/no_extrapolation.py       2      0   100%
turtleFSI/modules/no_fluid.py               8      0   100%
turtleFSI/modules/no_solid.py               8      0   100%
turtleFSI/modules/solid.py                 36     13    64%
turtleFSI/monolithic.py                   128     19    85%
turtleFSI/run_turtle.py                     8      1    88%
turtleFSI/utils/Probe.py                   70     49    30%
turtleFSI/utils/Womersley.py              138    119    14%
turtleFSI/utils/__init__.py                16     12    25%
turtleFSI/utils/argpar.py                 146     60    59%
-----------------------------------------------------------
TOTAL                                     836    370    56%