docker: actually remove the port mapping in host mode

[Khoyo]

No description provided.

[emersion]

LGTM

(For future reference, docs for this: https://docs.docker.com/reference/compose-file/merge/#reset-value)

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 42.50%. Comparing base (12d51f2) to head (d5e181c).
Report is 16 commits behind head on dev.

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Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #9603      +/-   ##
============================================
- Coverage     42.51%   42.50%   -0.02%     
  Complexity     2271     2271              
============================================
  Files          1311     1311              
  Lines        105411   105413       +2     
  Branches       3296     3297       +1     
============================================
- Hits          44815    44802      -13     
- Misses        58650    58665      +15     
  Partials       1946     1946              

Flag	Coverage Δ
core	75.05% <ø> (-0.02%)	⬇️
editoast	73.66% <ø> (-0.05%)	⬇️
front	18.79% <ø> (ø)
gateway	2.19% <ø> (ø)
osrdyne	3.28% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	86.74% <ø> (ø)

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[ElysaSrc]

Thanks !
Could you also add a commit to remove all version: '3' from the docker compose files since its deprecated in this PR ? (It's just, I'm thinking about doing a PR specifically for this for some time and it can fit this PR).