[Fix] Fixing http_request open_ai_client mixin

[sunishsheth2009]

What changes are proposed in this pull request?

• [Fix] Fixing http_request open_ai_client mixin

How is this tested?

https://dbc-436b86a5-6d5b.dev.databricks.com/editor/notebooks/2465247895264388?o=1593823105423000#command/7927901211745840

from databricks.sdk import WorkspaceClient
from databricks.sdk.service.serving import ExternalFunctionRequestHttpMethod

WorkspaceClient().serving_endpoints.http_request(
    conn="test_sql_slack",
    method=ExternalFunctionRequestHttpMethod.POST,
    path="/api/chat.postMessage",
    json={"channel": "C07MB25Q6H3", "text": "Hello!"}
)

Tried this and it works

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Inputs:

• PR number: 859
• Commit SHA: ee3b9225d74d21695f1f4092eb9f5eec415c0018

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