Check compatibility with Python latest versions

[VahidGh]

When trying to run this command (using Python 3.10), facing an error:

python cmaesfit_iid_noise.py --model wang --repeats 50

Traceback (most recent call last):
  File "model-reduction-manifold-boundaries/Parameter_inference_real_data/cmaesfit_iid_noise.py", line 8, in <module>
    import myokit
  File "model-reduction-manifold-boundaries/env/lib/python3.10/site-packages/myokit/__init__.py", line 561, in <module>
    from ._sim import (  # noqa
  File "model-reduction-manifold-boundaries/env/lib/python3.10/site-packages/myokit/_sim/__init__.py", line 44, in <module>
    import myokit.pype as pype  # noqa
  File "model-reduction-manifold-boundaries/env/lib/python3.10/site-packages/myokit/pype.py", line 12, in <module>
    import parser
ModuleNotFoundError: No module named 'parser'

It seems the older versions of myokit uses "parser" which has been deprecated in the latest versions of Python (>3.7).

Updated myokit to the latest version (1.35.4) and the problem solved.
Might be fixed as well by resolving issue #2 and using the latest versions of the packages in the requirements.txt file.
Meanwhile, it could be temporarily treated by mentioning the Python version matches the old requirements.txt.