fix: decoding when charset is in the content type response header

[manchuck]

Description

Motivation and Context

Testing Details

Example Output or Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[manchuck]

Address #903

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (05cbf33) 83.38% compared to head (3df49e4) 83.41%.

Files	Patch %	Lines
packages/server-client/lib/client.ts	90.90%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              3.x     #904      +/-   ##
==========================================
+ Coverage   83.38%   83.41%   +0.03%     
==========================================
  Files         121      121              
  Lines        1637     1646       +9     
  Branches      323      324       +1     
==========================================
+ Hits         1365     1373       +8     
- Misses        272      273       +1     

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