chore(ci): bump a2ml-validate-action (A2ML dialect fix) (#82)

Bumps the pinned a2ml-validate-action to pick up the dialect-recognition
fix (a2ml-validate-action#41). Clears false 'Validate A2ML manifests'
failures.

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'