fix: adjust decoding for amazon emails

[firstof9]

Proposed change

Fix decoding on amazon emails.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (which adds functionality)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests
• Documentation update
• Adds a new shipper
• Update existing shipper

Additional information

• This PR fixes or closes issue: fixes ISSUE: Problem decoding email message: Expected list, got <class 'str'> #1015

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

Attention: Patch coverage is 42.85714% with 8 lines in your changes missing coverage. Please review.

Project coverage is 93.13%. Comparing base (8608d22) to head (c4cb7c5).
Report is 51 commits behind head on dev.

Files with missing lines	Patch %	Lines
custom_components/mail_and_packages/helpers.py	42.85%	8 Missing ⚠️

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1025      +/-   ##
==========================================
- Coverage   95.07%   93.13%   -1.95%     
==========================================
  Files           8        8              
  Lines        1482     1616     +134     
==========================================
+ Hits         1409     1505      +96     
- Misses         73      111      +38     

Files with missing lines	Coverage Δ
custom_components/mail_and_packages/helpers.py	92.46% <42.85%> (-2.26%)	⬇️

... and 3 files with indirect coverage changes