Chaste-codegen

- Added support for Python 3.12.
- Updated dependency versions:
- decorator>=4.4.2, <6
- importlib-metadata>=1.7, <8
- lxml>=4.6.5, <6
- MarkupSafe>=1.1.1, <3
- mpmath>=1.1.0, <2
- networkx>=2.4, <4
- packaging>=20.4, <24
- Pint>=0.9, <0.30
- pyparsing>=2.4.7, <4
- rdflib>=5.0.0, <8
- zipp>=1.2.0, <4
- Jinja2>=3.0.0, <4

- Improved the developer documentation with regards to updating python packages, the ontology and releasing new versions of chaste_codegen.

- Updated ontology submodule (includes new `membrane_rapid_delayed_rectifier_potassium_current_open_probability`).
- Updated `requests` from 2.25.1 to 2.31.0 in /dev-requirements
- Updated `mpmath` from 1.2.1 to 1.3.0 in /dev-requirements

- Added checks to the resulting C++ code that will throw an error if concentrations go below 0, or if probabilities ere below 0 or above 1. Concetrations and probabilities are identified via existing metadata in the CellML.
- Added an exception using the ontology annotation not_a_probability_even_though_it_should_be to indicate probabilities that should not be checked as they may go outside the 0 ... 1 range.

- Added checks to the resulting C++ code, for state variables becoming INF or NAN.

- Pinned Pint version to be > 0.9 and < 0.20 since 0.20 has changed the location and number of arguments of the ScaleConverter and UnitDefinition classes.