ci: fix 2.21

[erikayasuda]

PRs included:

• chore(libdatadog): upgrade to v16.0.3 #12529

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/upgrade-libdatadog-v16-0-3-c47ce9b03c69cb63.yaml     @DataDog/apm-python
ddtrace/internal/datadog/profiling/cmake/FindLibdatadog.cmake           @DataDog/profiling-python
ddtrace/internal/datadog/profiling/dd_wrapper/src/sample.cpp            @DataDog/profiling-python
src/core/Cargo.lock                                                     @DataDog/apm-core-python
src/core/Cargo.toml                                                     @DataDog/apm-core-python