Update pixi env and Docker image for security reasons

Benjamin Bertrandrequested to merge
update-coverage into develop
  • Use coverage with C-extension for Python 3.15
  • Update pixi env with latest python versions
  • Force certifi >=2026.10.19 and pixi >=0.82.1
  • Update Docker image for Linux wheels with latest versions.

See https://discuss.python.org/t/information-for-python-users-regarding-emudhra-emsign-ca-certificate-security-incident/109576

Edited by Anton Joubert

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