Removed the pre-commit tox environment

Running "pre-commit run -a" is preferred.

Author: agronholm

pyproject.toml

@@ -89,20 +89,13 @@ show_missing = true
 [tool.tox]
 legacy_tox_ini = """
 [tox]
-envlist = pre-commit, py37, py38, py39, py310
+envlist = py37, py38, py39, py310
 skip_missing_interpreters = true
 isolated_build = true
 
 [testenv]
-depends = pre-commit
 extras = test
 setenv =
-    SQLALCHEMY_WARN_20 = true
+  SQLALCHEMY_WARN_20 = true
 commands = python -m pytest {posargs}
-
-[testenv:pre-commit]
-depends =
-deps = pre-commit
-commands = pre-commit run --all-files
-skip_install = true
 """