[FIX] Server embedder - send bytes as content

[PrimozGodec]

Issue

According to httpx sending bytes as data parameters is deprecated.

Description of changes

Use content for sending bytes and data for sending dictionaries

Includes

• [X] Code changes
• [X] Tests
• [ ] Documentation

[PrimozGodec]

/rebase

[PrimozGodec]

/rebase

[codecov[bot]]

Codecov Report

Merging #6051 (dc1693a) into master (263b782) will decrease coverage by 0.00%. The diff coverage is 100.00%.

:exclamation: Current head dc1693a differs from pull request most recent head 189fc02. Consider uploading reports for the commit 189fc02 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6051      +/-   ##
==========================================
- Coverage   86.62%   86.62%   -0.01%     
==========================================
  Files         315      315              
  Lines       67559    67480      -79     
==========================================
- Hits        58524    58454      -70     
+ Misses       9035     9026       -9     

[PrimozGodec]

/rebase