Update dependency version floors and drop Python 2 vestiges

- Remove `future` (Python 2 only) and `setuptools` from requirements.txt
- Bump urllib3 floor to 2.0 (1.x is EOL)
- Bump certifi floor to 2023.7.22 for security
- Bump python-dateutil floor to 2.8.2
- Modernize test deps: pytest >= 7.0, pytest-cov >= 4.0, pytest-randomly >= 3.12
- Align setup.py install_requires with requirements.txt

Author: ryuichis

requirements.txt

@@ -1,6 +1,4 @@
-certifi >= 14.05.14
-future; python_version<="2.7"
+certifi >= 2023.7.22
 six >= 1.10
-python_dateutil >= 2.5.3
-setuptools >= 21.0.0
-urllib3 >= 1.15.1
+python_dateutil >= 2.8.2
+urllib3 >= 2.0.0

setup.py

@@ -15,7 +15,7 @@
 # prerequisite: setuptools
 # http://pypi.python.org/pypi/setuptools
 
-REQUIRES = ["urllib3 >= 1.15", "six >= 1.10", "certifi", "python-dateutil"]
+REQUIRES = ["urllib3 >= 2.0.0", "six >= 1.10", "certifi >= 2023.7.22", "python-dateutil >= 2.8.2"]
 
 setup(
     name=NAME,

test-requirements.txt

@@ -1,3 +1,3 @@
-pytest~=4.6.7 # needed for python 2.7+3.4
-pytest-cov>=2.8.1
-pytest-randomly==1.2.3 # needed for python 2.7+3.4
+pytest >= 7.0
+pytest-cov >= 4.0
+pytest-randomly >= 3.12