Add __slots__ to timer helpers

[bdraco]

What do these changes do?

We use __slots__ almost everywhere else in the codebase, however __slots__ was missing for these helpers

related issue #4618 (comment)

Are there changes in behavior for the user?

no

Is it a substantial burden for the maintainers to support this?

no

[bdraco]

python/cpython#106771

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.57%. Comparing base (3f43bd1) to head (986129b).
Report is 3 commits behind head on master.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #9406   +/-   ##
=======================================
  Coverage   98.57%   98.57%           
=======================================
  Files         107      107           
  Lines       35037    35041    +4     
  Branches     4150     4150           
=======================================
+ Hits        34536    34540    +4     
  Misses        334      334           
  Partials      167      167           

Flag	Coverage Δ
CI-GHA	98.45% <100.00%> (+<0.01%)	⬆️
OS-Linux	98.11% <100.00%> (+<0.01%)	⬆️
OS-Windows	96.53% <100.00%> (+<0.01%)	⬆️
OS-macOS	97.80% <100.00%> (+<0.01%)	⬆️
Py-3.10.11	97.67% <100.00%> (+<0.01%)	⬆️
Py-3.10.15	97.60% <100.00%> (+<0.01%)	⬆️
Py-3.11.10	97.67% <100.00%> (+<0.01%)	⬆️
Py-3.11.9	97.75% <100.00%> (+<0.01%)	⬆️
Py-3.12.6	98.16% <100.00%> (+<0.01%)	⬆️
Py-3.13.0-rc.3	98.15% <100.00%> (+<0.01%)	⬆️
Py-3.9.13	97.56% <100.00%> (-0.01%)	⬇️
Py-3.9.20	97.50% <100.00%> (+<0.01%)	⬆️
Py-pypy7.3.16	97.12% <100.00%> (+<0.01%)	⬆️
VM-macos	97.80% <100.00%> (+<0.01%)	⬆️
VM-ubuntu	98.11% <100.00%> (+<0.01%)	⬆️
VM-windows	96.53% <100.00%> (+<0.01%)	⬆️

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[patchback]

Backport to 3.10: 💔 cherry-picking failed — conflicts found

❌ Failed to cleanly apply 24b0e6f on top of patchback/backports/3.10/24b0e6f7c9d5a0815aebdc0dde5ff9a860a550d9/pr-9406

Backporting merged PR #9406 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/3.10/24b0e6f7c9d5a0815aebdc0dde5ff9a860a550d9/pr-9406 upstream/3.10

4. Now, cherry-pick PR Add __slots__ to timer helpers #9406 contents into that branch:

   $ git cherry-pick -x 24b0e6f7c9d5a0815aebdc0dde5ff9a860a550d9

   If it'll yell at you with something like fatal: Commit 24b0e6f7c9d5a0815aebdc0dde5ff9a860a550d9 is a merge but no -m option was given., add -m 1 as follows instead:

   $ git cherry-pick -m1 -x 24b0e6f7c9d5a0815aebdc0dde5ff9a860a550d9

5. At this point, you'll probably encounter some merge conflicts. You must
   resolve them in to preserve the patch from PR Add __slots__ to timer helpers #9406 as close to the
   original as possible.
6. Push this branch to your fork on GitHub:

   $ git push origin patchback/backports/3.10/24b0e6f7c9d5a0815aebdc0dde5ff9a860a550d9/pr-9406

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.

[patchback]

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

❌ Failed to cleanly apply 24b0e6f on top of patchback/backports/3.11/24b0e6f7c9d5a0815aebdc0dde5ff9a860a550d9/pr-9406

Backporting merged PR #9406 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/3.11/24b0e6f7c9d5a0815aebdc0dde5ff9a860a550d9/pr-9406 upstream/3.11

4. Now, cherry-pick PR Add __slots__ to timer helpers #9406 contents into that branch:

   $ git cherry-pick -x 24b0e6f7c9d5a0815aebdc0dde5ff9a860a550d9

   If it'll yell at you with something like fatal: Commit 24b0e6f7c9d5a0815aebdc0dde5ff9a860a550d9 is a merge but no -m option was given., add -m 1 as follows instead:

   $ git cherry-pick -m1 -x 24b0e6f7c9d5a0815aebdc0dde5ff9a860a550d9

5. At this point, you'll probably encounter some merge conflicts. You must
   resolve them in to preserve the patch from PR Add __slots__ to timer helpers #9406 as close to the
   original as possible.
6. Push this branch to your fork on GitHub:

   $ git push origin patchback/backports/3.11/24b0e6f7c9d5a0815aebdc0dde5ff9a860a550d9/pr-9406

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.