Fix Argument parsing of update header

[y0urself]

What:

Why:

How:

Checklist:

• Tests
• Conventional commit message
• Documentation

[codecov]

Codecov Report

Merging #261 (7565aa4) into main (3aacd1d) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #261   +/-   ##
=======================================
  Coverage   86.61%   86.61%           
=======================================
  Files          23       23           
  Lines        1375     1375           
  Branches      210      210           
=======================================
  Hits         1191     1191           
  Misses        139      139           
  Partials       45       45           

Impacted Files	Coverage Δ
pontos/updateheader/updateheader.py	84.78% <100.00%> (ø)

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