Increase default healthcheck timeout

[flomonster]

This fixes a critical bug. Editoast was down because 500ms was not enough.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 80.05%. Comparing base (f2d4da3) to head (c893fd9).
Report is 90 commits behind head on dev.

Files with missing lines	Patch %	Lines
editoast/src/client/runserver.rs	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev   #10026      +/-   ##
==========================================
+ Coverage   80.04%   80.05%   +0.01%     
==========================================
  Files        1049     1050       +1     
  Lines      105292   105423     +131     
  Branches      757      757              
==========================================
+ Hits        84277    84394     +117     
- Misses      20974    20988      +14     
  Partials       41       41              

Flag	Coverage Δ
editoast	74.22% <0.00%> (-0.04%)	⬇️
front	89.25% <ø> (+0.01%)	⬆️
gateway	2.18% <ø> (ø)
osrdyne	3.28% <ø> (ø)
railjson_generator	87.50% <ø> (ø)
tests	87.00% <ø> (ø)

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