[Fix] Fix invalid hOCR format & PDF/A compatiblity with the kie preditor

[felixdittrich92]

This PR:

• Fix invalid hOCR format
• Fix xml export for kie_predictor
• fix mypy (ignore these here)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.60%. Comparing base (b84bb84) to head (c51f2aa).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1870      +/-   ##
==========================================
- Coverage   96.61%   96.60%   -0.02%     
==========================================
  Files         165      165              
  Lines        7941     7944       +3     
==========================================
+ Hits         7672     7674       +2     
- Misses        269      270       +1     

Flag	Coverage Δ
unittests	96.60% <100.00%> (-0.02%)	⬇️

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.