Bump rabbitmq to version 4

[flomonster]

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[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 38.45%. Comparing base (96c960e) to head (2db608d).
Report is 3 commits behind head on dev.

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Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #9294      +/-   ##
============================================
- Coverage     38.46%   38.45%   -0.02%     
  Complexity     2244     2244              
============================================
  Files          1288     1288              
  Lines         98429    98429              
  Branches       3273     3273              
============================================
- Hits          37856    37846      -10     
- Misses        58636    58646      +10     
  Partials       1937     1937              

Flag	Coverage Δ
core	74.87% <ø> (ø)
editoast	72.06% <ø> (-0.04%)	⬇️
front	10.13% <ø> (ø)
gateway	2.19% <ø> (ø)
osrdyne	2.43% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	86.71% <ø> (ø)

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