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

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

docs_src/dependencies/tutorial003_py310.py

@@ -0,0 +1,23 @@
+from fastapi import Depends, FastAPI
+
+app = FastAPI()
+
+
+fake_items_db = [{"item_name": "Foo"}, {"item_name": "Bar"}, {"item_name": "Baz"}]
+
+
+class CommonQueryParams:
+    def __init__(self, q: str | None = None, skip: int = 0, limit: int = 100):
+        self.q = q
+        self.skip = skip
+        self.limit = limit
+
+
+@app.get("/items/")
+async def read_items(commons=Depends(CommonQueryParams)):
+    response = {}
+    if commons.q:
+        response.update({"q": commons.q})
+    items = fake_items_db[commons.skip : commons.skip + commons.limit]
+    response.update({"items": items})
+    return response