Upgrade to Ubuntu 26.04

PBSrequested to merge
pbs3141/inkscape-ci-docker:resolute into master

To be undrafted when Ubuntu 26.04 is released (on 2026-04-23).

  • Docker image builds
  • Inkscape builds
  • Inkscape tests pass
  • lib2geom builds
  • lib2geom tests/coverage pass
  • AppImage works
Edited by PBS

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