Remove PytestRemovedIn7Warning

Fix #8838.

src/_pytest/warning_types.py

@@ -48,13 +48,6 @@ class PytestDeprecationWarning(PytestWarning, DeprecationWarning):
     __module__ = "pytest"
 
 
-@final
-class PytestRemovedIn7Warning(PytestDeprecationWarning):
-    """Warning class for features that will be removed in pytest 7."""
-
-    __module__ = "pytest"
-
-
 @final
 class PytestRemovedIn8Warning(PytestDeprecationWarning):
     """Warning class for features that will be removed in pytest 8."""

src/_pytest/warnings.py

@@ -49,8 +49,6 @@ def catch_warnings_for_item(
             warnings.filterwarnings("always", category=DeprecationWarning)
             warnings.filterwarnings("always", category=PendingDeprecationWarning)
 
-        warnings.filterwarnings("error", category=pytest.PytestRemovedIn7Warning)
-
         apply_warning_filters(config_filters, cmdline_filters)
 
         # apply filters from "filterwarnings" marks