[3.4] Update deps, allow Python 3.9, drop Fedora 32 (#5121) (#5296)

* 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

(cherry picked from commit 3254698c78)

Co-authored-by: palmtree5 <3577255+palmtree5@users.noreply.github.com>
Co-authored-by: jack1142 <6032823+jack1142@users.noreply.github.com>

Co-authored-by: palmtree5 <3577255+palmtree5@users.noreply.github.com>
Co-authored-by: jack1142 <6032823+jack1142@users.noreply.github.com>

redbot/__init__.py

@@ -227,3 +227,12 @@ if "--debug" not in _sys.argv:
     # Individual warnings - tracked in https://github.com/Cog-Creators/Red-DiscordBot/issues/3529
     # DeprecationWarning: an integer is required (got type float).  Implicit conversion to integers using __int__ is deprecated, and may be removed in a future version of Python.
     _warnings.filterwarnings("ignore", category=DeprecationWarning, module="importlib", lineno=219)
+    # DeprecationWarning: The loop argument is deprecated since Python 3.8, and scheduled for removal in Python 3.10
+    #   stdin, stdout, stderr = await tasks.gather(stdin, stdout, stderr,
+    # this is a bug in CPython
+    _warnings.filterwarnings(
+        "ignore",
+        category=DeprecationWarning,
+        module="asyncio",
+        message="The loop argument is deprecated since Python 3.8",
+    )