Update pandas version in docker image

[Ariana-B]

Reason for this pull request

Pandas 2.0 defaults to datetime.timezone instead of pytz for tzinfo. This causes the Query.__init__ docstring test to fail when run in the conda environment but pass when run with docker, which has pandas 1.5.

Proposed changes

• Update docstring test to expect datetime.timezone.utc instead of <UTC> in the timestamp
• Update docker image constraints to match pandas version in conda env

(Relevant changes are in docker/constraints.in, docker/constraints.txt, and datacube/api/query.py (plus of course docs/about/whats_new.rst). The other file changes are due to the copyright headers being automatically updated to the current year.)

• Closes API Query doctest fails due to different timezone representation #1485
• Tests added / passed
• Fully documented, including docs/about/whats_new.rst for all changes

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📚 Documentation preview 📚: https://datacube-core--1527.org.readthedocs.build/en/1527/

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (9fb8c8c) 91.75% compared to head (01f03c2) 91.79%.
Report is 5 commits behind head on develop.

❗ Current head 01f03c2 differs from pull request most recent head b48304f. Consider uploading reports for the commit b48304f to get more accurate results

Files	Patch %	Lines
datacube/index/memory/_datasets.py	80.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1527      +/-   ##
===========================================
+ Coverage    91.75%   91.79%   +0.04%     
===========================================
  Files          132      132              
  Lines        14552    14624      +72     
===========================================
+ Hits         13352    13424      +72     
  Misses        1200     1200              

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[SpacemanPaul]

As discussed, I think it would be easier to pin pandas directly in constraints.in

[SpacemanPaul]

Thanks,.