Add Retry type hint to StacApiIO

[rubenbaer]

Add Retry type hint so that a retry object so that the HTTPAdapters are correctly mounted.

Related Issue(s):

• Add Retry type hint to StacApiIO parameter max_retries #576

Description:

Add Retry type hint to StacApiIO.

PR Checklist:

• Code is formatted
• Tests pass
• Changes are added to the CHANGELOG

[gadomski]

Thanks for the docs fix as well!

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01% 🎉

Comparison is base (1454437) 88.67% compared to head (a4c89a0) 88.68%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #577      +/-   ##
==========================================
+ Coverage   88.67%   88.68%   +0.01%     
==========================================
  Files          13       13              
  Lines         989      990       +1     
==========================================
+ Hits          877      878       +1     
  Misses        112      112              

Files Changed	Coverage Δ
pystac_client/stac_api_io.py	91.22% <100.00%> (+0.07%)	⬆️

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