chore: update OpenAPI spec from monorepo (#674)

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

Author: openrouter-docs-sync[bot]

.speakeasy/in.openapi.yaml

@@ -20489,6 +20489,9 @@ components:
         anthropic:
           additionalProperties: {}
           type: 'object'
+        anthropic/2:
+          additionalProperties: {}
+          type: 'object'
         anyscale:
           additionalProperties: {}
           type: 'object'