chore(ci): bump a2ml-validate-action -> dialect-recognition fix (#31)

Picks up a2ml-validate-action@6c471745e88a which recognises colon/brace-block
identity (`name:`, `id:`) and AI.a2ml manifests — clears the false
'Validate A2ML manifests' failures in this repo.

Author: hyperpolymath

.github/workflows/dogfood-gate.yml

@@ -38,7 +38,7 @@ jobs:
 
       - name: Validate A2ML manifests
         if: steps.detect.outputs.count > 0
-        uses: hyperpolymath/a2ml-validate-action@59145c7d1039fa3059b3ecacdb50ee23d7505898 # main
+        uses: hyperpolymath/a2ml-validate-action@6c471745e88a10245aa1fcd6f637a17ec531ad27 # main
         with:
           path: '.'
           strict: 'false'