front, ci: bump node js (18 -> 20)

[clarani]

closes #8088

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 28.05%. Comparing base (7a4590d) to head (3a708f4).
Report is 2 commits behind head on dev.

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Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #8089      +/-   ##
============================================
- Coverage     28.05%   28.05%   -0.01%     
  Complexity     2081     2081              
============================================
  Files          1289     1289              
  Lines        157717   157718       +1     
  Branches       3114     3114              
============================================
- Hits          44254    44245       -9     
- Misses       111588   111598      +10     
  Partials       1875     1875              

Flag	Coverage Δ
core	75.19% <ø> (ø)
editoast	70.76% <ø> (-0.04%)	⬇️
front	9.90% <ø> (-0.01%)	⬇️
gateway	2.34% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	72.93% <ø> (ø)

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[anisometropie]

We should have a .nvmrc file to sync the dev environment with the docker containers
https://github.com/nvm-sh/nvm#nvmrc

@types/node major version should also match, but we already had "^20.11.16"

[ElysaSrc]

CI's working properly, tests are passing. I think it should be fine to merge this.

[ElysaSrc]

We should have a .nvmrc file to sync the dev environment with the docker containers https://github.com/nvm-sh/nvm#nvmrc

@types/node major version should also match, but we already had "^20.11.16"

Done.

[clarani]

LGTM

[SharglutDev]

Lgtm (not tested)