fixture: Slate yield_fixture decorator for removal in pytest 10.

Author: seifertm

changelog/14755.deprecation.rst

@@ -0,0 +1 @@
+Schedule *yield_fixture* decorator for removal in pytest 10.

src/_pytest/deprecated.py

@@ -29,7 +29,7 @@
 
 
 # This could have been removed pytest 8, but it's harmless and common, so no rush to remove.
-YIELD_FIXTURE = PytestDeprecationWarning(
+YIELD_FIXTURE = PytestRemovedIn10Warning(
     "@pytest.yield_fixture is deprecated.\n"
     "Use @pytest.fixture instead; they are the same."
 )

testing/deprecated_test.py

@@ -5,6 +5,7 @@
 from _pytest.pytester import Pytester
 import pytest
 from pytest import PytestDeprecationWarning
+from pytest import PytestRemovedIn10Warning
 
 
 @pytest.mark.parametrize("plugin", sorted(deprecated.DEPRECATED_EXTERNAL_PLUGINS))
@@ -66,7 +67,7 @@ def pytest_runtest_call(self):
 
 
 def test_yield_fixture_is_deprecated() -> None:
-    with pytest.warns(DeprecationWarning, match=r"yield_fixture is deprecated"):
+    with pytest.warns(PytestRemovedIn10Warning, match=r"yield_fixture is deprecated"):
 
         @pytest.yield_fixture  # type: ignore[deprecated]
         def fix():