python312Packages.flask-sqlalchemy: ignore deprecation warning

pkgs/development/python-modules/flask-sqlalchemy/default.nix

@@ -5,6 +5,7 @@
 , mock
 , flit-core
 , pytestCheckHook
+, pythonAtLeast
 , pythonOlder
 , sqlalchemy
 }:
@@ -43,6 +44,11 @@ buildPythonPackage rec {
     "test_persist_selectable"
   ];
 
+  pytestFlagsArray = lib.optionals (pythonAtLeast "3.12") [
+    # datetime.datetime.utcnow() is deprecated and scheduled for removal in a future version.
+    "-W" "ignore::DeprecationWarning"
+  ];
+
   pythonImportsCheck = [
     "flask_sqlalchemy"
   ];