fix(deps): update Starlette to avoid deprecated AnyIO alias (#1470)

tests/test_dependencywarnings.py

@@ -0,0 +1,16 @@
+"""Dependency imports used by the API must not rely on deprecated aliases."""
+
+import subprocess
+import sys
+
+
+def test_starlette_testclient_import_without_deprecated_anyio_alias():
+    # A fresh interpreter exercises the import even if test collection imported it already.
+    result = subprocess.run(
+        [sys.executable, "-W", "error::DeprecationWarning", "-c", "import starlette.testclient"],
+        capture_output=True,
+        text=True,
+        check=False,
+        timeout=30,
+    )
+    assert result.returncode == 0, result.stdout + result.stderr