dc_tools: use datacube functions

[pjonsson]

These functions were added to datacube
years ago, so use them instead of
the versions in odc.aws.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.40%. Comparing base (5eae869) to head (355f72c).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #672      +/-   ##
===========================================
- Coverage    78.14%   77.40%   -0.74%     
===========================================
  Files           39       39              
  Lines         3134     3134              
===========================================
- Hits          2449     2426      -23     
- Misses         685      708      +23     

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