Optional python-version input for the action

[ericwb]

Is your feature request related to a problem? Please describe.
Some users might like to run the action in the same version as their software.

Describe the solution you'd like
Provide a python-version input

  python-version:
    description: |
      Version of Python to use
    required: false
    default: '3.14'

    - name: Set up Python ${{ inputs.python-version }}
      uses: actions/setup-python@v5
      with:
        python-version: ${{ inputs.python-version }}

Describe alternatives you've considered
n/a

Additional context
n/a

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