pin flake, isort and mypy versions

setup.cfg

@@ -14,17 +14,17 @@ deps =
 commands = pytest -r s --cov --cov-report=term --cov-report=xml .
 
 [testenv:flake8]
-deps = flake8
+deps = flake8==7.1.0
 commands = flake8 .
 skip_install = True
 
 [testenv:isort]
-deps = isort
+deps = isort==5.13.2
 commands = isort --check --diff .
 skip_install = True
 
 [testenv:mypy]
-deps = mypy
+deps = mypy==1.11.0
 commands = mypy .
 skip_install = True