Fix getRawPacketReadOnly() const-correctness #1573

[egecetin]

Fix #1573

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.13%. Comparing base (35f486c) to head (a6eabd0).
Report is 4 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1637      +/-   ##
==========================================
- Coverage   83.14%   83.13%   -0.02%     
==========================================
  Files         276      276              
  Lines       47315    47315              
  Branches     9527     9512      -15     
==========================================
- Hits        39340    39335       -5     
- Misses       7088     7090       +2     
- Partials      887      890       +3     

Flag	Coverage Δ
fedora40	75.22% <ø> (-0.03%)	⬇️
macos-13	80.67% <100.00%> (ø)
macos-14	80.67% <100.00%> (ø)
macos-15	80.65% <100.00%> (ø)
mingw32	70.81% <ø> (-0.05%)	⬇️
mingw64	70.78% <ø> (-0.07%)	⬇️
npcap	85.19% <ø> (-0.02%)	⬇️
rhel94	75.07% <ø> (-0.03%)	⬇️
ubuntu2004	58.66% <ø> (ø)
ubuntu2004-zstd	58.79% <ø> (+<0.01%)	⬆️
ubuntu2204	75.00% <ø> (-0.03%)	⬇️
ubuntu2204-icpx	61.52% <100.00%> (ø)
ubuntu2404	75.25% <ø> (-0.03%)	⬇️
unittest	83.13% <100.00%> (-0.02%)	⬇️
windows-2019	85.23% <ø> (-0.02%)	⬇️
windows-2022	85.25% <ø> (-0.02%)	⬇️
winpcap	85.21% <ø> (ø)
xdp	50.22% <ø> (ø)

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