Fix test for compatibility with pytest 8.1 (#20225)

## Summary & Motivation

Pytest 8.1 was just released and breaks one of our tests, this fixes it.

## How I Tested These Changes

BK

python_modules/dagster/dagster_tests/definitions_tests/test_composition.py

@@ -527,16 +527,15 @@ def single_input_op():
 
 
 def test_collision_invocations():
-    with pytest.warns(None) as record:
+    with warnings.catch_warnings():
+        warnings.simplefilter("error")
 
         @job
         def _():
             single_input_op()
             single_input_op()
             single_input_op()
 
-    assert len(record) == 0
-
 
 def test_alias_invoked(recwarn):
     @job