Add Python 3.14 the the testing

[cclauss]

• https://www.python.org/download/pre-releases
• https://github.com/actions/setup-python/blob/main/docs/advanced-usage.md#allow-pre-releases

[Copilot]

Pull Request Overview

This PR adds Python 3.14 to the testing matrix for CI workflows and enables pre-release support. The changes ensure the project can test against the upcoming Python 3.14 pre-release version.

• Add Python 3.14 to the testing matrix
• Enable pre-release support in setup-python action
• Remove max-parallel configuration

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[Copilot]

Setting allow-prereleases: true globally affects all Python versions in the matrix, including stable releases. Consider applying this setting conditionally only for Python 3.14 to avoid potential issues with stable versions.

Suggested change

	- uses: actions/setup-python@v5
	with:
	python-version: ${{ matrix.python-version }}
	allow-prereleases: true
	- name: Set up Python (pre-release for 3.14)
	uses: actions/setup-python@v5
	if: matrix.python-version == '3.14'
	with:
	python-version: ${{ matrix.python-version }}
	allow-prereleases: true
	- name: Set up Python (stable)
	uses: actions/setup-python@v5
	if: matrix.python-version != '3.14'
	with:
	python-version: ${{ matrix.python-version }}

[cclauss]

This all looks good. We should be ready to make this shift when Python 3.14 is released in October 2025.