Remove pytest.deprecated_call() in TestAssoc::test_unknown

assoc() no longer raises a deprecation warning since commit
22ae847 but the 'with
pytest.deprecated_call():' in that test was not removed then (in
contrast with other test cases).

Maybe this got unnoticed due to a pytest bug?
In any case, using pytest 8+ (and keeping deprecated_call()) shows that
no warning is raised and the test fails.

Removing the upper bound on pytest in dev dependencies as tests now
pass with pytest 8.0.

Fix #1233.

pyproject.toml

@@ -41,8 +41,7 @@ tests-no-zope = [
   "hypothesis",
   "pympler",
   # 4.3.0 dropped last use of `convert`
-  # 8.0 broke something around warnings/exceptions
-  "pytest>=4.3.0,<8.0",
+  "pytest>=4.3.0",
   "pytest-xdist[psutil]",
   "attrs[tests-mypy]",
 ]

tests/test_funcs.py

@@ -600,9 +600,7 @@ def test_unknown(self, C):
         AttrsAttributeNotFoundError.
         """
         # No generated class will have a four letter attribute.
-        with pytest.raises(
-            AttrsAttributeNotFoundError
-        ) as e, pytest.deprecated_call():
+        with pytest.raises(AttrsAttributeNotFoundError) as e:
             assoc(C(), aaaa=2)
 
         assert (f"aaaa is not an attrs attribute on {C!r}.",) == e.value.args