✨ Add docs and tests for Python 3.9 and Python 3.10 (#3712)

Co-authored-by: Thomas Grainger <tagrain@gmail.com>

docs_src/body_nested_models/tutorial008_py39.py

@@ -0,0 +1,14 @@
+from fastapi import FastAPI
+from pydantic import BaseModel, HttpUrl
+
+app = FastAPI()
+
+
+class Image(BaseModel):
+    url: HttpUrl
+    name: str
+
+
+@app.post("/images/multiple/")
+async def create_multiple_images(images: list[Image]):
+    return images