Update validate-openapi.yml

Author: kwhinnery-openai

.github/workflows/validate-openapi.yml

@@ -14,4 +14,5 @@ jobs:
       # Run Spectral
       - uses: stoplightio/spectral-action@latest
         with:
-          file_glob: 'openapi.yaml'
+          file_glob: 'openapi.yaml'
+          spectral_ruleset: 'spectral:recommended'