Darryl L. Miles 03944ffe45 GHA: update canary-matrix.yml ...

Removes ubuntu-20.04 config (no longer available on GitHub CI)
added clang-19 and gcc-13
removed no_gc_gu, as all 'gl' (GL) options require 'gu' (GLU)
added build for --enable-readline-bundled
added X11+Cairo

2025-10-03 23:42:55 +01:00

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GHA: update canary-matrix.yml

2025-10-03 23:42:55 +01:00