Bump clang-format to 19.1.6

[egecetin]

Bumping version of clang-format to 19+ fixes weird formatting issue for struct initialization,

Before 19.x.x

struct abcd
{
};

After,

struct abcd{};

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 83.15%. Comparing base (7898a5d) to head (fd720f9).

Files with missing lines	Patch %	Lines
Packet++/src/VrrpLayer.cpp	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1677      +/-   ##
==========================================
- Coverage   83.16%   83.15%   -0.02%     
==========================================
  Files         277      277              
  Lines       48201    48201              
  Branches     9932     9946      +14     
==========================================
- Hits        40086    40081       -5     
+ Misses       7266     7229      -37     
- Partials      849      891      +42     

Flag	Coverage Δ
alpine320	75.16% <50.00%> (+<0.01%)	⬆️
fedora40	75.17% <50.00%> (+<0.01%)	⬆️
macos-13	80.65% <50.00%> (ø)
macos-14	80.65% <50.00%> (-0.01%)	⬇️
macos-15	80.63% <50.00%> (ø)
mingw32	70.87% <50.00%> (-0.05%)	⬇️
mingw64	70.84% <50.00%> (-0.05%)	⬇️
npcap	85.30% <50.00%> (-0.02%)	⬇️
rhel94	75.03% <50.00%> (+<0.01%)	⬆️
ubuntu2004	58.60% <50.00%> (-0.03%)	⬇️
ubuntu2004-zstd	58.73% <50.00%> (ø)
ubuntu2204	74.94% <50.00%> (-0.04%)	⬇️
ubuntu2204-icpx	61.39% <50.00%> (-0.05%)	⬇️
ubuntu2404	75.20% <50.00%> (-0.03%)	⬇️
unittest	83.15% <50.00%> (-0.02%)	⬇️
windows-2019	85.33% <50.00%> (-0.01%)	⬇️
windows-2022	85.36% <50.00%> (-0.01%)	⬇️
winpcap	85.33% <50.00%> (ø)
xdp	50.53% <50.00%> (ø)

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[seladb]

@egecetin please update the clang-format version mentioned in CONTRIBUTING.md?