test(tornado): Unpin pytest for tornado-latest tests (#3714)

The Pytest version pin is only needed for `tornado-v6.0` and `tornado-v6.2`. The incompatibility with the latest Pytest versions has been fixed in newer Tornado versions.

Author: szokeasaurusrex

tox.ini

@@ -673,7 +673,9 @@ deps =
     strawberry-latest: strawberry-graphql[fastapi,flask]
 
     # Tornado
-    tornado: pytest<8.2
+    # Tornado <6.4.1 is incompatible with Pytest ≥8.2
+    # See https://github.com/tornadoweb/tornado/pull/3382.
+    tornado-{v6.0,v6.2}: pytest<8.2
     tornado-v6.0: tornado~=6.0.0
     tornado-v6.2: tornado~=6.2.0
     tornado-latest: tornado