Set upper limit for project Python version

The version of Python used by the project infrastructure is controlled via the pyproject.yaml metadata file. Previously
the file specified that any version <=3.9.0 and <4.0.0 could be used, since it had been validated with 3.9 and
theoretically no breaking changes should be introduced without a major version bump.

However, there was a breaking change in Python version 3.12.0, which caused an incompatibility with the version of the
project's pyyaml Python package dependency. This caused the `poetry install` command to fail when Python 3.12 or newer was used:

```
ChefBuildError

  Backend subprocess exited when trying to invoke get_requires_for_build_wheel

  running egg_info
  writing lib/PyYAML.egg-info/PKG-INFO
  writing dependency_links to lib/PyYAML.egg-info/dependency_links.txt
  writing top-level names to lib/PyYAML.egg-info/top_level.txt
  Traceback (most recent call last):
    File "/opt/pipx/venvs/poetry/lib/python3.12/site-packages/pyproject_hooks/_in_process/_in_process.py", line 389, in <module>
      main()
    File "/opt/pipx/venvs/poetry/lib/python3.12/site-packages/pyproject_hooks/_in_process/_in_process.py", line 373, in main
      json_out["return_val"] = hook(**hook_input["kwargs"])
                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "/opt/pipx/venvs/poetry/lib/python3.12/site-packages/pyproject_hooks/_in_process/_in_process.py", line 143, in get_requires_for_build_wheel
      return hook(config_settings)
             ^^^^^^^^^^^^^^^^^^^^^
    File "/tmp/tmpigs9xbct/.venv/lib/python3.12/site-packages/setuptools/build_meta.py", line 334, in get_requires_for_build_wheel
      return self._get_build_requires(config_settings, requirements=[])
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "/tmp/tmpigs9xbct/.venv/lib/python3.12/site-packages/setuptools/build_meta.py", line 304, in _get_build_requires
      self.run_setup()
    File "/tmp/tmpigs9xbct/.venv/lib/python3.12/site-packages/setuptools/build_meta.py", line 320, in run_setup
      exec(code, locals())
    File "<string>", line 288, in <module>
    File "/tmp/tmpigs9xbct/.venv/lib/python3.12/site-packages/setuptools/__init__.py", line 117, in setup
      return distutils.core.setup(**attrs)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "/tmp/tmpigs9xbct/.venv/lib/python3.12/site-packages/setuptools/_distutils/core.py", line 183, in setup
      return run_commands(dist)
             ^^^^^^^^^^^^^^^^^^
    File "/tmp/tmpigs9xbct/.venv/lib/python3.12/site-packages/setuptools/_distutils/core.py", line 199, in run_commands
      dist.run_commands()
    File "/tmp/tmpigs9xbct/.venv/lib/python3.12/site-packages/setuptools/_distutils/dist.py", line 954, in run_commands
      self.run_command(cmd)
    File "/tmp/tmpigs9xbct/.venv/lib/python3.12/site-packages/setuptools/dist.py", line 995, in run_command
      super().run_command(command)
    File "/tmp/tmpigs9xbct/.venv/lib/python3.12/site-packages/setuptools/_distutils/dist.py", line 973, in run_command
      cmd_obj.run()
    File "/tmp/tmpigs9xbct/.venv/lib/python3.12/site-packages/setuptools/command/egg_info.py", line 313, in run
      self.find_sources()
    File "/tmp/tmpigs9xbct/.venv/lib/python3.12/site-packages/setuptools/command/egg_info.py", line 321, in find_sources
      mm.run()
    File "/tmp/tmpigs9xbct/.venv/lib/python3.12/site-packages/setuptools/command/egg_info.py", line 544, in run
      self.add_defaults()
    File "/tmp/tmpigs9xbct/.venv/lib/python3.12/site-packages/setuptools/command/egg_info.py", line 582, in add_defaults
      sdist.add_defaults(self)
    File "/tmp/tmpigs9xbct/.venv/lib/python3.12/site-packages/setuptools/command/sdist.py", line 109, in add_defaults
      super().add_defaults()
    File "/tmp/tmpigs9xbct/.venv/lib/python3.12/site-packages/setuptools/_distutils/command/sdist.py", line 238, in add_defaults
      self._add_defaults_ext()
    File "/tmp/tmpigs9xbct/.venv/lib/python3.12/site-packages/setuptools/_distutils/command/sdist.py", line 323, in _add_defaults_ext
      self.filelist.extend(build_ext.get_source_files())
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "<string>", line 204, in get_source_files
    File "/tmp/tmpigs9xbct/.venv/lib/python3.12/site-packages/setuptools/_distutils/cmd.py", line 107, in __getattr__
      raise AttributeError(attr)
  AttributeError: cython_sources

  at /opt/pipx/venvs/poetry/lib/python3.12/site-packages/poetry/installation/chef.py:164 in _prepare
      160│
      161│                 error = ChefBuildError("\n\n".join(message_parts))
      162│
      163│             if error is not None:
    → 164│                 raise error from None
      165│
      166│             return path
      167│
      168│     def _prepare_sdist(self, archive: Path, destination: Path | None = None) -> Path:

Note: This error originates from the build backend, and is likely not a problem with poetry but with pyyaml (6.0) not supporting PEP 517 builds. You can verify this by running 'pip wheel --no-cache-dir --use-pep517 "pyyaml (==6.0)"'.
```

Although the incompatibility has already been fixed in pyyaml, this is a transitive dependency and so it might be
difficult to update the version used by the project.

So the chosen solution is to adjust the Python version constraints to require a version less than 3.12.0 to be used.
This will still allow a reasonable range of Python versions to make the infrastructure more friendly to local use by
contributors, while ensuring that a compatible version is used.

Author: per1234

poetry.lock

@@ -8,7 +8,7 @@ description = ""
 authors = ["Arduino <[email protected]>"]
 
 [tool.poetry.dependencies]
-python = "^3.9"
+python = ">=3.9.0, <3.12.0"
 requests = "^2.32.3"
 
 [tool.poetry.group.dev.dependencies]