Fix refleak in super_descr_get

[brandtbucher]

supercheck returns a new reference.

[miss-islington]

Thanks @brandtbucher for the PR, and @kumaraditya303 for merging it 🌮🎉.. I'm working now to backport this PR to: 3.11.
🐍🍒⛏🤖

[miss-islington]

Sorry, @brandtbucher and @kumaraditya303, I could not cleanly backport this to 3.11 due to a conflict.
Please backport using cherry_picker on command line.
cherry_picker a781484c8e9834538e5ee7b9e2e6bec7b679e033 3.11

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot s390x SLES 3.x has failed when building commit a781484.

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/all/#builders/540/builds/5241) and take a look at the build logs.
4. Check if the failure is related to this commit (a781484) 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/all/#builders/540/builds/5241

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

== Tests result: ENV CHANGED ==

443 tests OK.

10 slowest tests:

• test_tools: 2 min 41 sec
• test_concurrent_futures: 2 min 23 sec
• test_multiprocessing_spawn: 2 min
• test_multiprocessing_fork: 1 min 38 sec
• test_math: 1 min 25 sec
• test_multiprocessing_forkserver: 1 min 19 sec
• test_capi: 1 min 14 sec
• test_signal: 1 min 12 sec
• test_gdb: 54.0 sec
• test_tokenize: 49.7 sec

1 test altered the execution environment:
test.test_asyncio.test_subprocess

19 tests skipped:
test.test_asyncio.test_windows_events
test.test_asyncio.test_windows_utils test_devpoll test_ioctl
test_kqueue test_launcher test_msilib test_nis test_peg_generator
test_perf_profiler test_startfile test_tix test_tkinter test_ttk
test_winconsoleio test_winreg test_winsound test_wmi
test_zipfile64

Total duration: 6 min 26 sec

Click to see traceback logs

remote: Enumerating objects: 7, done.        
remote: Counting objects:  14% (1/7)        
remote: Counting objects:  28% (2/7)        
remote: Counting objects:  42% (3/7)        
remote: Counting objects:  57% (4/7)        
remote: Counting objects:  71% (5/7)        
remote: Counting objects:  85% (6/7)        
remote: Counting objects: 100% (7/7)        
remote: Counting objects: 100% (7/7), done.        
remote: Compressing objects:  25% (1/4)        
remote: Compressing objects:  50% (2/4)        
remote: Compressing objects:  75% (3/4)        
remote: Compressing objects: 100% (4/4)        
remote: Compressing objects: 100% (4/4), done.        
remote: Total 4 (delta 3), reused 0 (delta 0), pack-reused 0        
From https://github.com/python/cpython
 * branch                  main       -> FETCH_HEAD
Note: switching to 'a781484c8e9834538e5ee7b9e2e6bec7b679e033'.

You are in 'detached HEAD' state. You can look around, make experimental
changes and commit them, and you can discard any commits you make in this
state without impacting any branches by switching back to a branch.

If you want to create a new branch to retain commits you create, you may
do so (now or later) by using -c with the switch command. Example:

  git switch -c <new-branch-name>

Or undo this operation with:

  git switch -

Turn off this advice by setting config variable advice.detachedHead to false

HEAD is now at a781484c8e Fix refleak in `super_descr_get` (#104408)
Switched to and reset branch 'main'

make: *** [Makefile:1955: buildbottest] Error 3

[bedevere-bot]

GH-104440 is a backport of this pull request to the 3.11 branch.