Drop Python 3.8

[Dreamsorcerer]

The 3.11 release won't happen for some time, so we can start dropping support from the codebase now.

[bdraco]

There is a resolver test to still cleanup as well

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.13%. Comparing base (e13175f) to head (5b6d15d).
Report is 1002 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8797      +/-   ##
==========================================
- Coverage   98.13%   98.13%   -0.01%     
==========================================
  Files         107      107              
  Lines       34082    34075       -7     
  Branches     4030     4026       -4     
==========================================
- Hits        33448    33441       -7     
  Misses        457      457              
  Partials      177      177              

Flag	Coverage Δ
CI-GHA	98.03% <100.00%> (+<0.01%)	⬆️
OS-Linux	97.69% <50.00%> (+<0.01%)	⬆️
OS-Windows	96.07% <50.00%> (+<0.01%)	⬆️
OS-macOS	97.35% <50.00%> (+<0.01%)	⬆️
Py-3.10.11	97.44% <100.00%> (+<0.01%)	⬆️
Py-3.10.14	97.39% <50.00%> (+<0.01%)	⬆️
Py-3.11.9	97.63% <100.00%> (+<0.01%)	⬆️
Py-3.12.4	97.74% <100.00%> (+<0.01%)	⬆️
Py-3.12.5	?
Py-3.8.10	?
Py-3.8.18	?
Py-3.9.13	97.34% <100.00%> (+<0.01%)	⬆️
Py-3.9.19	97.30% <50.00%> (+<0.01%)	⬆️
Py-pypy7.3.16	96.91% <50.00%> (+<0.01%)	⬆️
VM-macos	97.35% <50.00%> (+<0.01%)	⬆️
VM-ubuntu	97.69% <50.00%> (+<0.01%)	⬆️
VM-windows	96.07% <50.00%> (+<0.01%)	⬆️

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[patchback]

Backport to 3.11: 💔 cherry-picking failed — conflicts found

❌ Failed to cleanly apply 5be5af3 on top of patchback/backports/3.11/5be5af3c900ef9ead3387a1193fc4ff4ad1e5594/pr-8797

Backporting merged PR #8797 into master

1. Ensure you have a local repo clone of your fork. Unless you cloned it
   from the upstream, this would be your origin remote.
2. Make sure you have an upstream repo added as a remote too. In these
   instructions you'll refer to it by the name upstream. If you don't
   have it, here's how you can add it:

   $ git remote add upstream https://github.com/aio-libs/aiohttp.git

3. Ensure you have the latest copy of upstream and prepare a branch
   that will hold the backported code:

   $ git fetch upstream
   $ git checkout -b patchback/backports/3.11/5be5af3c900ef9ead3387a1193fc4ff4ad1e5594/pr-8797 upstream/3.11

4. Now, cherry-pick PR Drop Python 3.8 #8797 contents into that branch:

   $ git cherry-pick -x 5be5af3c900ef9ead3387a1193fc4ff4ad1e5594

   If it'll yell at you with something like fatal: Commit 5be5af3c900ef9ead3387a1193fc4ff4ad1e5594 is a merge but no -m option was given., add -m 1 as follows instead:

   $ git cherry-pick -m1 -x 5be5af3c900ef9ead3387a1193fc4ff4ad1e5594

5. At this point, you'll probably encounter some merge conflicts. You must
   resolve them in to preserve the patch from PR Drop Python 3.8 #8797 as close to the
   original as possible.
6. Push this branch to your fork on GitHub:

   $ git push origin patchback/backports/3.11/5be5af3c900ef9ead3387a1193fc4ff4ad1e5594/pr-8797

7. Create a PR, ensure that the CI is green. If it's not — update it so that
   the tests and any other checks pass. This is it!
   Now relax and wait for the maintainers to process your pull request
   when they have some cycles to do reviews. Don't worry — they'll tell you if
   any improvements are necessary when the time comes!

🤖 @patchback
I'm built with octomachinery and
my source is open — https://github.com/sanitizers/patchback-github-app.