chore(ci): pin greenlet version for failing ci_visibility jobs with python 3.8

[erikayasuda]

Context

Failing tests slipped into the 2.19 branch, one of them being this gevent test failure. This was addressed in a fix PR to the main branch, and was backported to 2.19. However, once backporting this fix, ci_visibility tests on python 3.8 started to fail consistently.

After some digging, it turns out that in the backported fix for gevent, the greenlet dependency was bumped from 3.0.3 to 3.1.1, which according to greenlet documentation, 3.1.0 was the last release to support 3.7 and 3.8. Looks like pip didn't catch this during the upgrade because the minimum runtime version is still pinned to 3.7 in greenlet.

Description

This PR pins greenlet to 3.1.0 for python<=3.8, and will use latest for 3.9+. The failing ci_visibility tests will pass on 3.8 now.

Checklist

• PR author has checked that all the criteria below are met
• The PR description includes an overview of the change
• The PR description articulates the motivation for the change
• The change includes tests OR the PR description describes a testing strategy
• The PR description notes risks associated with the change, if any
• Newly-added code is easy to change
• The change follows the library release note guidelines
• The change includes or references documentation updates if necessary
• Backport labels are set (if applicable)

Reviewer Checklist

• Reviewer has checked that all the criteria below are met
• Title is accurate
• All changes are related to the pull request's stated goal
• Avoids breaking API changes
• Testing strategy adequately addresses listed risks
• Newly-added code is easy to change
• Release note makes sense to a user of the library
• If necessary, author has acknowledged and discussed the performance implications of this PR as reported in the benchmarks PR comment
• Backport labels are set in a manner that is consistent with the release branch maintenance policy

[github-actions]

CODEOWNERS have been resolved as:

.riot/requirements/1d4e95e.txt                                          @DataDog/apm-python
.riot/requirements/1b90fc9.txt                                          @DataDog/apm-python
.riot/requirements/61891b4.txt                                          @DataDog/apm-python
.riot/requirements/d171c08.txt                                          @DataDog/apm-python
.riot/requirements/de578a7.txt                                          @DataDog/apm-python
riotfile.py                                                             @DataDog/apm-python
.riot/requirements/6bec1ec.txt                                          @DataDog/apm-python

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-01-14 23:29:56

Comparing candidate commit 521acb9 in PR branch erikayasuda/pin-greenlet-3.8 with baseline commit befc80b in branch 2.19.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 394 metrics, 2 unstable metrics.

[erikayasuda]

Closing this in favor of backporting this: #11953

The requirements files generated are pretty different, probably because I iterated a few times on this as a test branch. I'll do a clean backport and remediate any merge conflicts instead so future backports to 2.19 aren't messed up.