chore: update OpenAPI spec from monorepo (#1283)

Co-authored-by: OpenRouter SDK Bot <sdk-bot@openrouter.ai>

Author: openrouter-docs-sync[bot]

.speakeasy/in.openapi.yaml

@@ -31723,6 +31723,7 @@ components:
         - 'bedrock-xai-responses-v1'
         - 'xai-responses-v1'
         - 'meta-responses-v1'
+        - 'google-vertex-responses-v1'
         - 'openrouter-stealth-v1'
         - 'anthropic-claude-v1'
         - 'google-gemini-v1'