Typing failure fix

[pjbull]

Azure SDK typing indicates return type ItemPaged[BlobProperties | BlobPrefix] for walk_blobs.

Per this issue, BlobPrefix is only returned if the delimiter kwarg is passed. Since we do not do that, we can safely ignore the typing issue and both walk_blobs and list_blobs will return ItemPaged[BlobProperties] as we expect.

Closes #523

[github-actions]

🚀 Deployed on https://deploy-preview-524--gallant-agnesi-5f7bb3.netlify.app

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.4%. Comparing base (65c5c01) to head (342b0f1).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #524     +/-   ##
========================================
- Coverage    93.5%   93.4%   -0.2%     
========================================
  Files          23      23             
  Lines        1800    1800             
========================================
- Hits         1684    1682      -2     
- Misses        116     118      +2     

Files with missing lines	Coverage Δ
cloudpathlib/azure/azblobclient.py	91.9% <100.0%> (ø)

... and 1 file with indirect coverage changes

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