Move 3.11 tests to install aiohttp without C extensions (#3258)

* Move 311 tests to install aiohttp without C extensions

- Configure tox to install aiohttp without extensions
  - i.e. use `AIOHTTP_NO_EXTENSIONS=1` for pip install
  - This allows us to reenable blackd tests that use aiohttp testing helpers etc.
- Had to ignore `cgi` module deprecation warning
  - Filed issue for aiohttp to fix: aio-libs/aiohttp#6905

Test:
- `/tmp/tb/bin/tox -e 311`

* Fix formatting + linting

* Add latest aiohttp for loop fix + Try to exempt deprecation warning but failed - will ask for help

* Remove unnecessary warning ignore

Co-authored-by: Cooper Ry Lees <me@wcooperlees.com>
Co-authored-by: Richard Si <63936253+ichard26@users.noreply.github.com>

Author: 3 people

.github/workflows/test-311.yml

@@ -1,4 +1,4 @@
-name: Partially test 3.11 dev
+name: Test 3.11 without aiohttp extensions
 
 on:
   push:

pyproject.toml

@@ -111,4 +111,7 @@ filterwarnings = [
     # this is mitigated by https://github.com/python/cpython/issues/79071 in python 3.8+
     # this ignore can be removed when support for 3.7 is dropped.
     '''ignore:Bare functions are deprecated, use async ones:DeprecationWarning''',
+    # aiohttp is using deprecated cgi modules - Safe to remove when fixed:
+    # https://github.com/aio-libs/aiohttp/issues/6905
+    '''ignore:'cgi' is deprecated and slated for removal in Python 3.13:DeprecationWarning''',
 ]