Fix type hint backward compatibility

[fbunt]

Fixes #153

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.32%. Comparing base (6af5d0c) to head (663af37).
Report is 29 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #154      +/-   ##
===========================================
+ Coverage    95.26%   95.32%   +0.05%     
===========================================
  Files           31       31              
  Lines         5323     5451     +128     
===========================================
+ Hits          5071     5196     +125     
- Misses         252      255       +3     

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[Kirill888]

@fbunt thanks, but can you please fix this via import from future instead, like here for example:

odc-geo/odc/geo/_xr_interop.py

Line 8 in 72e873a

from __future__ import annotations

[SpacemanPaul]

I see setup.cfg still advertises support for Python >=3.8.

This should probably be bumped to at least 3.9 as 3.8 is now end-of-lifed and unmaintained.

[fbunt]

@Kirill888 Oh I didn't know about that one, thanks! Done.