Drop support for EOL Python 3.7 (#1065)

* Add python_requires to help pip

* Update supported versions in tox.ini

* Upgrade Python syntax with pyupgrade --py37-plus

* Bump GitHub Actions

* Add Python 3.11 and 3.12 to CI

* Remove six dependency

* Remove redundant dependencies

* Remove redudant Python 3.5 code

* Drop support for EOL Python 3.7

* Upgrade Python syntax with pyupgrade --py38-plus

* Update CHANGELOG

* More f-strings

---------

Co-authored-by: Hugo van Kemenade <hugovk@users.noreply.github.com>

setup.py

@@ -1,6 +1,6 @@
 from setuptools import setup
 
-with open("README.md", "r") as f:
+with open("README.md") as f:
     long_description = f.read()
 
 test_reqs = [
@@ -28,11 +28,10 @@ setup(
     project_urls={
         'Source': 'https://github.com/plamere/spotipy',
     },
+    python_requires='>3.8',
     install_requires=[
         "redis>=3.5.3",
-        "redis<4.0.0;python_version<'3.4'",
         "requests>=2.25.0",
-        "six>=1.15.0",
         "urllib3>=1.26.0"
     ],
     tests_require=test_reqs,