test(tox): Unpin pytest for celery tests (#3701)

Unpin pytest for Celery tests. This requires adding a placeholder test to workaround a bug with pytest-forked.

ref #3035

Author: szokeasaurusrex

tests/integrations/celery/test_celery.py

@@ -831,3 +831,11 @@ def test_send_task_wrapped(
     assert span["description"] == "very_creative_task_name"
     assert span["op"] == "queue.submit.celery"
     assert span["trace_id"] == kwargs["headers"]["sentry-trace"].split("-")[0]
+
+
+@pytest.mark.skip(reason="placeholder so that forked test does not come last")
+def test_placeholder():
+    """Forked tests must not come last in the module.
+    See https://github.com/pytest-dev/pytest-forked/issues/67#issuecomment-1964718720.
+    """
+    pass

tox.ini

@@ -375,7 +375,6 @@ deps =
     celery-latest: Celery
 
     celery: newrelic
-    celery: pytest<7
     {py3.7}-celery: importlib-metadata<5.0
 
     # Chalice