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

docs_src/request_forms/tutorial001_an_py39.py

@@ -1,10 +0,0 @@
-from typing import Annotated
-
-from fastapi import FastAPI, Form
-
-app = FastAPI()
-
-
-@app.post("/login/")
-async def login(username: Annotated[str, Form()], password: Annotated[str, Form()]):
-    return {"username": username}

docs_src/request_forms/tutorial001_py39.py

@@ -1,8 +0,0 @@
-from fastapi import FastAPI, Form
-
-app = FastAPI()
-
-
-@app.post("/login/")
-async def login(username: str = Form(), password: str = Form()):
-    return {"username": username}