pyproject.toml: Fix PEP 660 builds by setting build-system to use poetry-core

[bkeryan]

• This contribution adheres to CONTRIBUTING.md.
• I've updated CHANGELOG.md if applicabl
• I've added tests applicable for this pull request

What does this Pull Request accomplish?

Change the build system from poetry to poetry-core.

Why should this Pull Request be merged?

Enables clients to install the nidaqmx package in editable mode, outside of this project.

Without this, you get an error like:

pip install -e .
Obtaining file:///C:/dev/nidaqmx-python
  Installing build dependencies ... done
  Checking if build backend supports build_editable ... done
ERROR: Project file:///C:/dev/nidaqmx-python has a 'pyproject.toml' and its build backend is missing the 'build_editable' hook. Since it does not have a 'setup.py' nor a 'setup.cfg', it cannot be installed in editable mode. Consider using a build backend that supports PEP 660.

What testing has been done?

cd $env:TEMP
python -m venv .edit_nidaqmx
.\.edit_nidaqmx\Scripts\pip.exe install -e C:\dev\nidaqmx-python\

[github-actions]

Test Results

    34 files  ±0      34 suites  ±0   57m 14s ⏱️ -11s
 2 396 tests ±0   2 042 ✅ ±0    354 💤 ±0  0 ❌ ±0 
43 102 runs  ±0  36 850 ✅ ±0  6 252 💤 ±0  0 ❌ ±0 

Results for commit 04a8a18. ± Comparison against base commit c58d74d.