gh-103056: use staticmethod decorator for _gnv_

[ethanfurman]

gnv --> _generate_next_value_

• Issue: Enum._generate_next_value_ should be static #103056

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot aarch64 Fedora Stable Clang 3.x has failed when building commit 810d365.

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/234/builds/3386) and take a look at the build logs.
4. Check if the failure is related to this commit (810d365) 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/234/builds/3386

Failed tests:

• test_asyncio

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

==

Click to see traceback logs

Note: switching to '810d365b5eb2cf3043957ca2971f6e7a7cd87d0d'.

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 810d365b5e gh-103056: [Enum] use staticmethod decorator for _gnv_ (GH-103231)
Switched to and reset branch 'main'

Timeout (0:15:00)!
Thread 0x0000ffffba047020 (most recent call first):
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-stable-aarch64.clang/build/Lib/test/test_asyncio/test_tasks.py", line 137 in __del__
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-stable-aarch64.clang/build/Lib/test/test_asyncio/test_tasks.py", line 142 in test_task_del_collect
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-stable-aarch64.clang/build/Lib/unittest/case.py", line 589 in _callTestMethod
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-stable-aarch64.clang/build/Lib/unittest/case.py", line 634 in run
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-stable-aarch64.clang/build/Lib/unittest/case.py", line 690 in __call__
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-stable-aarch64.clang/build/Lib/unittest/suite.py", line 122 in run
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-stable-aarch64.clang/build/Lib/unittest/suite.py", line 84 in __call__
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-stable-aarch64.clang/build/Lib/unittest/suite.py", line 122 in run
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-stable-aarch64.clang/build/Lib/unittest/suite.py", line 84 in __call__
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-stable-aarch64.clang/build/Lib/unittest/suite.py", line 122 in run
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-stable-aarch64.clang/build/Lib/unittest/suite.py", line 84 in __call__
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-stable-aarch64.clang/build/Lib/unittest/suite.py", line 122 in run
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-stable-aarch64.clang/build/Lib/unittest/suite.py", line 84 in __call__
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-stable-aarch64.clang/build/Lib/unittest/suite.py", line 122 in run
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-stable-aarch64.clang/build/Lib/unittest/suite.py", line 84 in __call__
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-stable-aarch64.clang/build/Lib/unittest/runner.py", line 240 in run
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-stable-aarch64.clang/build/Lib/test/support/__init__.py", line 1106 in _run_suite
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-stable-aarch64.clang/build/Lib/test/support/__init__.py", line 1232 in run_unittest
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-stable-aarch64.clang/build/Lib/test/libregrtest/runtest.py", line 281 in _test_module
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-stable-aarch64.clang/build/Lib/test/libregrtest/runtest.py", line 317 in _runtest_inner2
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-stable-aarch64.clang/build/Lib/test/libregrtest/runtest.py", line 360 in _runtest_inner
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-stable-aarch64.clang/build/Lib/test/libregrtest/runtest.py", line 235 in _runtest
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-stable-aarch64.clang/build/Lib/test/libregrtest/runtest.py", line 265 in runtest
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-stable-aarch64.clang/build/Lib/test/libregrtest/main.py", line 353 in rerun_failed_tests
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-stable-aarch64.clang/build/Lib/test/libregrtest/main.py", line 756 in _main
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-stable-aarch64.clang/build/Lib/test/libregrtest/main.py", line 711 in main
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-stable-aarch64.clang/build/Lib/test/libregrtest/main.py", line 775 in main
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-stable-aarch64.clang/build/Lib/test/__main__.py", line 2 in <module>
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-stable-aarch64.clang/build/Lib/runpy.py", line 88 in _run_code
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-stable-aarch64.clang/build/Lib/runpy.py", line 198 in _run_module_as_main
make: *** [Makefile:1950: buildbottest] Error 1

Cannot open file '/home/buildbot/buildarea/3.x.cstratak-fedora-stable-aarch64.clang/build/test-results.xml' for upload