chore(tests): fix tz warning

[Kyle-Verhoog]

Running the tests locally, I get:

DeprecationWarning: datetime.datetime.utcnow() is deprecated and scheduled for removal in a future version. Use timezone-aware objects to represent datetimes in UTC

The recommended upgrade is to use datetime.now(timezone.utc) which is what is done here.

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:

tests/utils.py                                                          @DataDog/python-guild

[datadog-dd-trace-py-rkomorn]

Datadog Report

Branch report: kylev/fix-tz-warning
Commit report: 2e83161
Test service: dd-trace-py

✅ 0 Failed, 918 Passed, 550 Skipped, 13m 13.37s Total duration (23m 10.84s time saved)

[pr-commenter]

Benchmarks

Benchmark execution time: 2024-11-22 22:51:08

Comparing candidate commit 2e83161 in PR branch kylev/fix-tz-warning with baseline commit defea4e in branch main.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 264 metrics, 2 unstable metrics.