editoast: fix openapi missing trailing slash

[flomonster]

No description provided.

[codecov]

Codecov Report

Merging #4364 (fb1ce68) into dev (0d7faae) will decrease coverage by 0.01%.
The diff coverage is 66.66%.

@@             Coverage Diff              @@
##                dev    #4364      +/-   ##
============================================
- Coverage     21.71%   21.71%   -0.01%     
  Complexity     2194     2194              
============================================
  Files           843      843              
  Lines         83680    83680              
  Branches       2178     2178              
============================================
- Hits          18169    18168       -1     
- Misses        64309    64310       +1     
  Partials       1202     1202              

Flag	Coverage Δ
editoast	69.41% <ø> (-0.02%)	⬇️
front	9.87% <66.66%> (ø)

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Impacted Files	Coverage Δ
front/src/common/api/osrdEditoastApi.ts	91.96% <66.66%> (ø)

... and 1 file with indirect coverage changes