These were using the now deprecated hotshot profiler
We have not been relying on these tests since forever
https://stackoverflow.com/questions/56147071/modulenotfounderror-no-module-named-hotshot

Closes #160

Test: remove broken tests

We don't support Python 2 since a long time now

We do not support version below Python 3.7

Deprecate utils.is_str

Utils: drop _find_xml_generator_for_legacy_python

Closes #148

Utils: add support for new c++ versions

Use the modern `setuptools.build_meta` backend rather than the legacy
backend that is implied by the lack of `build-backend`.

This is documented in PEP 517:

> If the `pyproject.toml` file is absent, or the `build-backend` key is
> missing, the source tree is not using this specification, and tools
> should revert to the legacy behaviour of running `setup.py` (either
> directly, or by implicitly invoking
> the `setuptools.build_meta:__legacy__` backend).

https://peps.python.org/pep-0517/#source-trees

Remove the redundant `wheel` dependency, as it is added by the backend
automatically.  Listing it explicitly in the documentation was
a historical mistake and has been fixed since, see:
pypa/setuptools@f7d30a9

Needs another token. Will add codecov back later.
This is just to unblock the CI

tests: remove codecov

The castxml binary is for Intel macOS -> point to macos-12.

ci: explicitly specify macos runner version

Build: pyproject.xml fixes

Bump version 2.5.0

Merge develop into master