suppress tornado deprecation warnings (#882)

Author: minrk

pyproject.toml

@@ -100,7 +100,9 @@ timeout = 300
 # timeout_method = "thread"
 filterwarnings = [
   "error",
-  "ignore:There is no current event loop:DeprecationWarning",
+  "module:make_current is deprecated:DeprecationWarning",
+  "module:clear_current is deprecated:DeprecationWarning",
+  "module:There is no current event loop:DeprecationWarning",
   "ignore:Passing a schema to Validator.iter_errors:DeprecationWarning",
   "ignore:unclosed <socket.socket:ResourceWarning",
   "ignore:unclosed event loop:ResourceWarning",