stores: various type fixes

[pjonsson]

---

📚 Documentation preview 📚: https://datacube-explorer--832.org.readthedocs.build/en/832/

[codecov]

Codecov Report

❌ Patch coverage is 83.33333% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.33%. Comparing base (a6f12ce) to head (e7d08d9).
⚠️ Report is 6 commits behind head on develop.

Files with missing lines	Patch %	Lines
cubedash/summary/_stores.py	66.66%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #832      +/-   ##
===========================================
- Coverage    84.35%   84.33%   -0.02%     
===========================================
  Files           35       35              
  Lines         4244     4246       +2     
  Branches       537      537              
===========================================
+ Hits          3580     3581       +1     
- Misses         468      469       +1     
  Partials       196      196              

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