Use datetime.utcnow() to avoid timezone issues

[judahrand]

Signed-off-by: Judah Rand 17158624+judahrand@users.noreply.github.com

What this PR does / why we need it:

Use datetime.now has the potential for timezone issues, especially when persisting the data to the Registry.

Which issue(s) this PR fixes:

Use datetime.utcnowinstead.

Fixes #

Does this PR introduce a user-facing change?:

None

[judahrand]

/ok-to-test

[codecov-commenter]

Codecov Report

Merging #2265 (2de9394) into master (592af75) will increase coverage by 0.15%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2265      +/-   ##
==========================================
+ Coverage   85.27%   85.42%   +0.15%     
==========================================
  Files         108      112       +4     
  Lines        9127     9593     +466     
==========================================
+ Hits         7783     8195     +412     
- Misses       1344     1398      +54     

Flag	Coverage Δ
integrationtests	73.95% <100.00%> (+0.61%)	⬆️
unittests	58.60% <66.66%> (-1.15%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
sdk/python/feast/registry.py	83.28% <100.00%> (ø)
sdk/python/feast/diff/infra_diff.py	75.30% <0.00%> (-2.90%)	⬇️
sdk/python/feast/inference.py	84.84% <0.00%> (-2.66%)	⬇️
sdk/python/feast/data_source.py	60.55% <0.00%> (-0.74%)	⬇️
sdk/python/feast/errors.py	70.51% <0.00%> (-0.33%)	⬇️
sdk/python/feast/type_map.py	69.13% <0.00%> (-0.10%)	⬇️
sdk/python/feast/repo_config.py	88.82% <0.00%> (ø)
sdk/python/tests/integration/e2e/test_usage_e2e.py	100.00% <0.00%> (ø)
...fline_store/test_universal_historical_retrieval.py	100.00% <0.00%> (ø)
sdk/python/feast/diff/FcoDiff.py
... and 14 more

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[pyalex]

/lgtm

[adchia]

/lgtm

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: adchia, judahrand, pyalex

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