fix: wrapping context __exit__ leak

[P403n1x87]

We fix a leak in the universal wrapping context caused to bound exit method leaking in CPython 3.9 and 3.10. This was due to a reference to the bound method exit of the universal wrapping context not getting popped from the stack before every return statement. Every call to a wrapped function would then create one such bounded method object that would not get GC'd. No other versions of CPython are affected because the bytecode and/or approach are different.

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:

releasenotes/notes/fix-wrapping-context-memory-leak-ad3d8f27586ba662.yaml  @DataDog/apm-python
ddtrace/internal/wrapping/context.py                                    @DataDog/apm-core-python
tests/internal/test_wrapping.py                                         @DataDog/debugger-python @DataDog/apm-core-python

[github-actions]

Bootstrap import analysis

Comparison of import times between this PR and base.

Summary

The average import time from this PR is: 273 ± 3 ms.

The average import time from base is: 275 ± 4 ms.

The import time difference between this PR and base is: -2.1 ± 0.2 ms.

Import time breakdown

The following import paths have shrunk:

ddtrace.auto 2.006 ms (0.74%)

ddtrace.bootstrap.sitecustomize 1.327 ms (0.49%)

ddtrace.bootstrap.preload 1.327 ms (0.49%)

ddtrace.internal.remoteconfig.client 0.652 ms (0.24%)

ddtrace 0.680 ms (0.25%)

ddtrace.internal._unpatched 0.023 ms (0.01%)

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-06-09 14:20:47

Comparing candidate commit d99949c in PR branch fix/wrapping-context-memory-leak with baseline commit 10e09e0 in branch main.

Found 0 performance improvements and 2 performance regressions! Performance is the same for 549 metrics, 3 unstable metrics.

scenario:iastaspects-upper_aspect

• 🟥 execution_time [+179.813ns; +234.954ns] or [+7.922%; +10.351%]

scenario:iastaspectsospath-ospathnormcase_aspect

• 🟥 execution_time [+420.536ns; +467.938ns] or [+12.213%; +13.589%]

[tylfin]

LGTM