Add slots to dataclasses with Python 3.10+

[bdraco]

I'm 50/50 on if we should move this forward as I'm not sure 4.x will be out by the time we drop python 3.9 support and once we do we can add slots=True to all the dataclasses anyways (if we don't forget)

What do these changes do?

Add slots to dataclasses with Python 3.10+. No need to backport as 3.x uses attrs and already has slots here.

This idea comes from https://github.com/esphome/aioesphomeapi/blob/main/aioesphomeapi/model.py where we have a lot of small data classes generated from protobuf messages but still need to support older python.

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]

3.x already has slots

aiohttp/client.py:@attr.s(auto_attribs=True, frozen=True, slots=True)
aiohttp/client_reqrep.py:@attr.s(auto_attribs=True, frozen=True, slots=True)
aiohttp/client_reqrep.py:@attr.s(auto_attribs=True, frozen=True, slots=True)
aiohttp/client_reqrep.py:@attr.s(auto_attribs=True, slots=True, frozen=True, cache_hash=True)
aiohttp/client_ws.py:@attr.s(frozen=True, slots=True)
aiohttp/helpers.py:@attr.s(auto_attribs=True, frozen=True, slots=True)
aiohttp/helpers.py:@attr.s(auto_attribs=True, frozen=True, slots=True)
aiohttp/helpers.py:@attr.s(auto_attribs=True, frozen=True, slots=True)
aiohttp/tracing.py:@attr.s(auto_attribs=True, frozen=True, slots=True)
aiohttp/tracing.py:@attr.s(auto_attribs=True, frozen=True, slots=True)
aiohttp/tracing.py:@attr.s(auto_attribs=True, frozen=True, slots=True)
aiohttp/tracing.py:@attr.s(auto_attribs=True, frozen=True, slots=True)
aiohttp/tracing.py:@attr.s(auto_attribs=True, frozen=True, slots=True)
aiohttp/tracing.py:@attr.s(auto_attribs=True, frozen=True, slots=True)
aiohttp/tracing.py:@attr.s(auto_attribs=True, frozen=True, slots=True)
aiohttp/tracing.py:@attr.s(auto_attribs=True, frozen=True, slots=True)
aiohttp/tracing.py:@attr.s(auto_attribs=True, frozen=True, slots=True)
aiohttp/tracing.py:@attr.s(auto_attribs=True, frozen=True, slots=True)
aiohttp/tracing.py:@attr.s(auto_attribs=True, frozen=True, slots=True)
aiohttp/tracing.py:@attr.s(auto_attribs=True, frozen=True, slots=True)
aiohttp/tracing.py:@attr.s(auto_attribs=True, frozen=True, slots=True)
aiohttp/tracing.py:@attr.s(auto_attribs=True, frozen=True, slots=True)
aiohttp/tracing.py:@attr.s(auto_attribs=True, frozen=True, slots=True)
aiohttp/tracing.py:@attr.s(auto_attribs=True, frozen=True, slots=True)
aiohttp/web_protocol.py:@attr.s(auto_attribs=True, frozen=True, slots=True)
aiohttp/web_request.py:@attr.s(auto_attribs=True, frozen=True, slots=True)
aiohttp/web_routedef.py:@attr.s(auto_attribs=True, frozen=True, repr=False, slots=True)
aiohttp/web_routedef.py:@attr.s(auto_attribs=True, frozen=True, repr=False, slots=True)
aiohttp/web_ws.py:@attr.s(auto_attribs=True, frozen=True, slots=True)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.57%. Comparing base (24b0e6f) to head (b3d666e).

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9413      +/-   ##
==========================================
- Coverage   98.57%   98.57%   -0.01%     
==========================================
  Files         107      107              
  Lines       35048    35046       -2     
  Branches     4150     4151       +1     
==========================================
- Hits        34547    34545       -2     
  Misses        334      334              
  Partials      167      167              

Flag	Coverage Δ
CI-GHA	98.44% <97.05%> (-0.01%)	⬇️
OS-Linux	98.11% <97.05%> (-0.01%)	⬇️
OS-Windows	96.52% <96.55%> (-0.01%)	⬇️
OS-macOS	97.80% <97.05%> (-0.01%)	⬇️
Py-3.10.11	97.66% <94.11%> (-0.01%)	⬇️
Py-3.10.15	97.60% <94.11%> (-0.01%)	⬇️
Py-3.11.10	97.67% <94.11%> (-0.01%)	⬇️
Py-3.11.9	97.74% <94.11%> (-0.01%)	⬇️
Py-3.12.6	98.16% <94.11%> (-0.01%)	⬇️
Py-3.13.0-rc.3	98.14% <94.11%> (-0.01%)	⬇️
Py-3.9.13	97.56% <94.11%> (-0.01%)	⬇️
Py-3.9.20	97.50% <94.11%> (-0.01%)	⬇️
Py-pypy7.3.16	97.12% <94.11%> (-0.01%)	⬇️
VM-macos	97.80% <97.05%> (-0.01%)	⬇️
VM-ubuntu	98.11% <97.05%> (-0.01%)	⬇️
VM-windows	96.52% <96.55%> (-0.01%)	⬇️

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