replace utcnow

[braingram]

updates use of utcnow (deprecated in python 3.12) with an equivalent call that returns a non-timezone aware utc timestamp

Regression tests: https://plwishmaster.stsci.edu:8081/job/RT/job/JWST-Developers-Pull-Requests/1023/

Showed the expected niriss failures due to crds file updates and also showed 2 failures:

• test_nirspec_missing_msa_fail
• test_nirspec_missing_msa_nofail

As these tests appear to sometimes fail (possibly due to test ordering or io buffering) they were re-run in another test run:
https://plwishmaster.stsci.edu:8081/blue/organizations/jenkins/RT%2FJWST-Developers-Pull-Requests/detail/JWST-Developers-Pull-Requests/1026/pipeline/199
where they both passed.

This PR removes one of the python 3.12 failures:

FAILED tests/test_util.py::test_create_history_entry - DeprecationWarning: datetime.datetime.utcnow() is deprecated and scheduled ...

see in a CI run on main:
https://github.com/spacetelescope/stdatamodels/actions/runs/6669314479/job/18126824996
but not seen in the CI run for this PR:
https://github.com/spacetelescope/stdatamodels/actions/runs/6669380674/job/18127057458?pr=231

The remaining failures are due to crds use of ast.Str: spacetelescope/crds#1000
The crds issues are addressed in: spacetelescope/crds#1007
and a test PR with the changes in this PR and crds shows passing python 3.12 unit tests in stdatamodels: #233

Checklist

• added entry in CHANGES.rst (either in Bug Fixes or Changes to API)
• updated relevant tests
• updated relevant documentation
• updated relevant milestone(s)
• added relevant label(s)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f42b477) 64.67% compared to head (bb201c6) 64.62%.

❗ Current head bb201c6 differs from pull request most recent head 2611c05. Consider uploading reports for the commit 2611c05 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #231      +/-   ##
==========================================
- Coverage   64.67%   64.62%   -0.05%     
==========================================
  Files         102      102              
  Lines        5662     5660       -2     
==========================================
- Hits         3662     3658       -4     
- Misses       2000     2002       +2     

☔ View full report in Codecov by Sentry.
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[WilliamJamieson]

Any reason to not inline dt inside entry?

[hbushouse]

@braingram Could you rebase with latest masters and run the regtests again?

[braingram]

There's a similar PR for jwst: spacetelescope/jwst#8051
I was going to leave that as draft until the effort to support python 3.12 was started but should I update that jwst PR also (and open it for review)?

[hbushouse]

There's a similar PR for jwst: spacetelescope/jwst#8051 I was going to leave that as draft until the effort to support python 3.12 was started but should I update that jwst PR also (and open it for review)?

I don't see the harm in future proofing the code now, even before we're ready to allow py 3.12. That way it's ready to go, and any tests we run against 3.12 won't have this issue.

[braingram]

Regression tests running at: https://plwishmaster.stsci.edu:8081/job/RT/job/JWST-Developers-Pull-Requests/1058/

[braingram]

Regression tests passed with no errors.