[flake8-pytest-style] Note the pytest 10 removal of yield_fixture in PT020

pytest-dev/pytest#14755 slated the decorator for removal in pytest 10; it
now raises `PytestRemovedIn10Warning` instead of a bare deprecation warning.

Author: Pierre-Sassoulas

crates/ruff_linter/src/rules/flake8_pytest_style/rules/fixture.rs

@@ -387,7 +387,8 @@ impl Violation for PytestFixtureParamWithoutValue {
 ///
 /// ## Why is this bad?
 /// `pytest.yield_fixture` has been deprecated since pytest 6.2, and is a plain
-/// alias for `pytest.fixture`. `pytest.fixture` should be used instead.
+/// alias for `pytest.fixture`. It will be removed in pytest 10, so
+/// `pytest.fixture` should be used instead.
 ///
 /// ## Example
 /// ```python