remove deprecated python_venv alias

tests/all_languages_test.py

@@ -1,7 +0,0 @@
-from __future__ import annotations
-
-from pre_commit.all_languages import languages
-
-
-def test_python_venv_is_an_alias_to_python():
-    assert languages['python_venv'] is languages['python']

tests/repository_test.py

@@ -80,24 +80,6 @@ def _test_hook_repo(
     assert out == expected
 
 
-def test_python_venv_deprecation(store, caplog):
-    config = {
-        'repo': 'local',
-        'hooks': [{
-            'id': 'example',
-            'name': 'example',
-            'language': 'python_venv',
-            'entry': 'echo hi',
-        }],
-    }
-    _get_hook(config, store, 'example')
-    assert caplog.messages[-1] == (
-        '`repo: local` uses deprecated `language: python_venv`.  '
-        'This is an alias for `language: python`.  '
-        'Often `pre-commit autoupdate --repo local` will fix this.'
-    )
-
-
 def test_system_hook_with_spaces(tempdir_factory, store):
     _test_hook_repo(
         tempdir_factory, store, 'system_hook_with_spaces_repo',