Update version, document smtp fix, and merge

[pierre-b]

Increment minor version to 13.5 and document the fix for multi CC/BCC recipients in SMTP transport.

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[cursor]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.51%. Comparing base (9fb474b) to head (dc93f74).
⚠️ Report is 8 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev      #65   +/-   ##
=======================================
  Coverage   81.51%   81.51%           
=======================================
  Files         148      148           
  Lines       27941    27941           
=======================================
  Hits        22777    22777           
  Misses       4081     4081           
  Partials     1083     1083           

Flag	Coverage Δ
unit	81.51% <ø> (ø)

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