gh-129813: Fix typo in byteswriter_resize()

[vstinner]

The intent is to test "resize and overallocate", even if in practice "resize & overallocate" is the same (both variables are either 0 or 1). Use "&&" to better describe the intent of the test.

• Issue: [C API] PEP 782: Add PyBytesWriter API #129813

[miss-islington-app]

Thanks @vstinner for the PR 🌮🎉.. I'm working now to backport this PR to: 3.15.
🐍🍒⛏🤖

[bedevere-app]

GH-156979 is a backport of this pull request to the 3.15 branch.

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot AMD64 Windows11 Non-Debug 3.x (tier-1) has failed when building commit 5141621.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/#/builders/914/builds/6044) and take a look at the build logs.
4. Check if the failure is related to this commit (5141621) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/#/builders/914/builds/6044

Failed tests:

• test_wmi

Failed subtests:

• test_wmi_query_repeated - test.test_wmi.WmiTests.test_wmi_query_repeated

Summary of the results of the build (if available):

==

Click to see traceback logs

Traceback (most recent call last):
  File "b:\uildarea\3.x.ware-win11.nondebug\build\Lib\test\test_wmi.py", line 41, in test_wmi_query_repeated
    self.test_wmi_query_os_version()
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "b:\uildarea\3.x.ware-win11.nondebug\build\Lib\test\test_wmi.py", line 30, in test_wmi_query_os_version
    self.assertEqual(1, len(r))
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^
AssertionError: 1 != 5