gh-95573: Reduce test data size in test_asyncio/test_ssl.py

[fantix]

The error was like:

Task exception was never retrieved
future: <Task finished name='Task-79' coro=<TestSSL.test_create_server_ssl_over_ssl.<locals>.handle_client() done, defined at cpython/Lib/test/test_asyncio/test_ssl.py:1039> exception=OSError(55, 'No buffer space available')>
Traceback (most recent call last):
  File "cpython/Lib/test/test_asyncio/test_ssl.py", line 1042, in handle_client
    data = await reader.readexactly(len(A_DATA))
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "cpython/Lib/asyncio/streams.py", line 728, in readexactly
    await self._wait_for_data('readexactly')
  File "cpython/Lib/asyncio/streams.py", line 522, in _wait_for_data
    await self._waiter
  File "cpython/Lib/asyncio/selector_events.py", line 1049, in write
    n = self._sock.send(data)
        ^^^^^^^^^^^^^^^^^^^^^
OSError: [Errno 55] No buffer space available

It was suppressed because of this:

cpython/Lib/test/test_asyncio/test_ssl.py

Lines 1159 to 1160 in 8a0d9a6

	with self._silence_eof_received_warning():
	self.loop.run_until_complete(start_server())

• Issue: test_asyncio: test_create_server_ssl_over_ssl() failed on ARM64 macOS 3.x #95573

[bedevere-bot]

🤖 New build scheduled with the buildbot fleet by @pablogsal for commit 4284913 🤖

If you want to schedule another build, you need to add the ":hammer: test-with-buildbots" label again.

[ambv]

Note: all tests with buildbots pass here with 4284913. The red x is due to missing Misc/NEWS, which I fixed now. Additionally, as discussed on GH-95573, I made the smaller buffer only apply on macOS.

[miss-islington]

Thanks @fantix for the PR, and @ambv for merging it 🌮🎉.. I'm working now to backport this PR to: 3.11.
🐍🍒⛏🤖

[bedevere-bot]

GH-95705 is a backport of this pull request to the 3.11 branch.