Update deps, allow Python 3.9, drop Fedora 32 (#5121)

* Update deps + allow Python 3.9

* Add in updates from Jack's branch

* Fix multiple target for cross-reference warnings

* Update a few more Python 3.8 occurrences

* Bump further

* Don't install tox in CodeQL environment

* Bump Python version in docs to 3.9.7

* more bumps

* Add missing pin

* Stop using the deprecated distro.linux_distribution()

* Suppress deprecation warning

* Fix OpenSUSE Leap instructions

* Drop Fedora 32

* Add Python 3.10-dev to CI

* meh

Co-authored-by: jack1142 <6032823+jack1142@users.noreply.github.com>

setup.py

@@ -1,4 +1,10 @@
+import os
+import sys
 from setuptools import setup
 
-# Metadata and options defined in setup.cfg
-setup()
+if os.getenv("TOX_RED", False) and sys.version_info >= (3, 10):
+    # We want to be able to test Python versions that we do not support yet.
+    setup(python_requires=">=3.8.1")
+else:
+    # Metadata and options defined in setup.cfg
+    setup()