fix(worker): replace deprecated cgi.parse_header

[jooola]

Backport for dbf4667

[codecov]

Codecov Report

Merging #2333 (8730295) into 3.0.x (6966664) will increase coverage by 0.19%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##            3.0.x    #2333      +/-   ##
==========================================
+ Coverage   60.70%   60.90%   +0.19%     
==========================================
  Files         178      179       +1     
  Lines        4344     4366      +22     
==========================================
+ Hits         2637     2659      +22     
  Misses       1707     1707              

Flag	Coverage Δ
worker	93.25% <100.00%> (+2.21%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
worker/libretime_worker/tasks.py	91.42% <100.00%> (+0.38%)	⬆️
worker/libretime_worker/config.py	100.00% <0.00%> (ø)

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