remove legacy python versions

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 envlist=
-    coveralls, pylint, flake8, pydocstyle, 2.7, 3.5, 3.6, 3.7, 3.8, 3.9, 3.10, 3.11, pypy2.7, pypy3.9
+    coveralls, pylint, flake8, pydocstyle, 3.8, 3.9, 3.10, 3.11, 3.12, pypy3.9, pypy3.10
 
 [testenv]
 deps=
@@ -10,15 +10,16 @@ deps=
     typing_extensions
     httpx
     fastapi
+    flask<2.2
+    aiohttp<=3.9.0b1
     numpy
     scipy
     boto3
     mypy_boto3_s3
+    pydantic<2
+    werkzeug<=2.2.2
 extras=
     yaml
-    pydantic<2
-    flask
-    aiohttp
 commands = pytest -c tests/.configs/pytest.ini
 python_files = test_*_py3*.py
 
@@ -28,7 +29,7 @@ basepython=python3.12
 usedevelop=True
 deps=
     {[testenv]deps}
-    cython
+    cython<0.30
     coverage
     coveralls
 commands=
@@ -37,49 +38,27 @@ commands=
     coverage report --rcfile=./.coveragerc
     coveralls
 
-[testenv:2.7]
-deps=
-    pytest
-extras=
-    yaml
-    flask
-commands = pytest -c tests/.configs/pytest-py27.ini
-
-[testenv:3.5]
-deps=
-    pytest
-    pytest-asyncio
-    contextvars
-extras=
-    yaml
-    flask
-commands = pytest -c tests/.configs/pytest-py35.ini
-
-[testenv:pypy2.7]
-deps=
-    pytest
-extras=
-    yaml
-    flask
-commands = pytest -c tests/.configs/pytest-py27.ini
-
 [testenv:pypy3.9]
 deps=
     pytest
     pytest-asyncio
     httpx
+    flask<2.2
+    pydantic<2
+    werkzeug<=2.2.2 
     fastapi
     boto3
     mypy_boto3_s3
 extras=
     yaml
-    flask
-commands = pytest -c tests/.configs/pytest-py27.ini
+commands = pytest -c tests/.configs/pytest-py35.ini
 
 
 [testenv:pylint]
 deps=
     pylint
+    flask<2.2
+    werkzeug<=2.2.2
 commands=
     - pylint -f colorized --rcfile=./.pylintrc src/dependency_injector