Fix Kerberos parsing after KB5068222

[gpotter2]

• Fix Kerberos parsing after https://support.microsoft.com/en-us/topic/strengthening-administrator-protection-and-kerberos-authentication-f67abf78-41c5-4a89-a2da-a7b2fe280270. The field appears to be currently undocumented, so the name is a placeholder :/

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.88%. Comparing base (90c5ff4) to head (eb995cd).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4850      +/-   ##
==========================================
- Coverage   80.88%   80.88%   -0.01%     
==========================================
  Files         368      368              
  Lines       90340    90340              
==========================================
- Hits        73068    73067       -1     
- Misses      17272    17273       +1     

Files with missing lines	Coverage Δ
scapy/layers/kerberos.py	60.81% <ø> (ø)

... and 6 files with indirect coverage changes

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