OpenAPI spec doesn't allow embedding response to be base64 encoded string

When I call the embeddings API with encoding_format=base64, the embedding field of the response item is a string.

curl -v https://api.openai.com/v1/embeddings \
-H "Authorization: Bearer $OPENAI_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"input": "The food was delicious",
"model": "text-embedding-3-small",
"encoding_format": "base64",
"dimensions":10
}'

{
  "object": "list",
  "data": [
    {
      "object": "embedding",
      "index": 0,
      "embedding": "nMcovm6gOb7ldwO/AESlvk0Avz2nZIq+3c+EvZvdFT9HsZa9oSy+vg=="    <------ THIS
    }
  ],
  "model": "text-embedding-3-small",
  "usage": {
    "prompt_tokens": 4,
    "total_tokens": 4
  }
}

However, the OpenAPI spec does not reflect that:

https://github.com/openai/openai-openapi/blob/acea67a5045a6873c6eb2573a6be0e0a7b092ec6/openapi.yaml#L17047-L17052

Start in openapi.yaml at the schema around lines 17047-17052 and compare it with the embeddings API example in the issue. Update the response schema so the embedding field reflects the base64 string form as well as the existing form, then verify the generated specification accepts the documented response.