project, contestの終了時期を未定に戻す更新が出来るようにした

[Tennessine699]

resolves #694

[codecov]

Codecov Report

Attention: Patch coverage is 89.65517% with 3 lines in your changes missing coverage. Please review.

Project coverage is 71.17%. Comparing base (5eaab30) to head (0c1df6d).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/infrastructure/repository/project_impl.go	83.33%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #727      +/-   ##
==========================================
+ Coverage   71.00%   71.17%   +0.17%     
==========================================
  Files          42       42              
  Lines        4576     4593      +17     
==========================================
+ Hits         3249     3269      +20     
+ Misses       1170     1166       -4     
- Partials      157      158       +1     

Flag	Coverage Δ
integration	71.17% <89.65%> (+0.17%)	⬆️
unit	71.17% <89.65%> (+0.17%)	⬆️

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[H1rono]

他は良さそうに見えます