SDC release candidate 0 for v1.4.0

[bnavigator]

• First release candidate from the SOFIA Data Center
• Update dependency versions for current support windows
  • Support Python 3.11 to 3.13
  • Update API usage for Astropy, NumPy, SciPy, Matplotlib, Pandas, ...
  • Switch from pyds9 to ds9samp for interaction with DS9
  • Use PyQt6 for the GUI
• Update CI/CD setup for Uni Stuttgart internal GitHub Enterprise
  with local runners
• Include FIFI-LS pipeline updates developed at DSI and SDC
  • Telluric scaling
  • ATRAN spectra interpolation
  • New discard logic for pointing errors

Full Changelog: v1.3.3...v1.4.0rc0

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This discussion was created from the release SDC release candidate 0 for v1.4.0.