fix: replace datetime.datetime.utcnow which is deprecated

[njzjz]

Fix #4063.

Summary by CodeRabbit

• Improvements
  • Enhanced the accuracy and clarity of time representation in the model saving feature.
  • Updated copyright year retrieval to ensure timezone awareness for improved precision.
  • Expanded linting capabilities by adding datetime-related checks, which can improve code quality.

[coderabbitai]

Walkthrough

Walkthrough

The recent changes enhance UTC time handling in the save_dp_model function by replacing the deprecated datetime.utcnow() with datetime.datetime.now(tz=datetime.timezone.utc), ensuring better timezone clarity. Additionally, the pyproject.toml file now includes a new entry, "DTZ", to improve linting capabilities for datetime usage. These updates aim to bolster code quality and adherence to best practices.

Changes

Files	Change Summary
deepmd/dpmodel/utils/serialization.py, doc/conf.py	Updated time retrieval to use timezone-aware UTC time in both serialization and copyright declarations.
pyproject.toml	Added "DTZ" to select list for improved datetime linting checks.

Assessment against linked issues

Objective	Addressed	Explanation
Deprecation of datetime.datetime.utcnow() (#[4063])	✅

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.95%. Comparing base (d77c075) to head (d0ba537).
Report is 173 commits behind head on devel.

Additional details and impacted files

@@           Coverage Diff           @@
##            devel    #4067   +/-   ##
=======================================
  Coverage   82.95%   82.95%           
=======================================
  Files         522      522           
  Lines       51044    51045    +1     
  Branches     3031     3028    -3     
=======================================
+ Hits        42341    42342    +1     
+ Misses       7759     7757    -2     
- Partials      944      946    +2     

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