chore: update gappa to version 1.6.0#28914

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Justme0606 wants to merge 3 commits intoocaml:masterfrom

Justme0606:add-gappa-1.6.0

Commits on Nov 20, 2025

gappa.1.6.0: disable x86_32 builds due to upstream issues
Justme0606
committed
Revert unintended changes to conf-bison, conf-flex and conf-autotools
Justme0606
committed
chore(gappa.1.6.0): condition {dev} for autotools and add x-maintenance-intent
Justme0606
committed