Try Nuitka instead of PyInstaller for creating the executable

[marph91]

Last log: https://github.com/marph91/jimmy/actions/runs/27882256949

Findings

• Executable size almost the same.
• Speed almost the same.
• Build time is longer (15-30 minutes).
• Ubuntu build only successful with latest Ubuntu (24.04). Else ValueError: compression parameter 'nb_workers' received an illegal value 4; the valid range is [0, 0].
• Pandoc is not bundled automatically in Windows (smoke test fails). I didn't dig deeper to find a solution.

Conclusion

For now, it's not worth to switch to Nuitka. May check again in future.