🔥 Remove Python 3.9 specific files, no longer needed after updating translations (#14931)

docs_src/async_tests/app_a_py39/main.py

@@ -1,8 +0,0 @@
-from fastapi import FastAPI
-
-app = FastAPI()
-
-
-@app.get("/")
-async def root():
-    return {"message": "Tomato"}

docs_src/async_tests/app_a_py39/test_main.py

@@ -1,14 +0,0 @@
-import pytest
-from httpx import ASGITransport, AsyncClient
-
-from .main import app
-
-
-@pytest.mark.anyio
-async def test_root():
-    async with AsyncClient(
-        transport=ASGITransport(app=app), base_url="http://test"
-    ) as ac:
-        response = await ac.get("/")
-    assert response.status_code == 200
-    assert response.json() == {"message": "Tomato"}