Update dependency

[MonkAlex]

Simple dependency update, local test worked well.

Later try to update:

• [x] nunit
• [ ] opencover (Manga.Core removed from coverage results, no idea why)
• [ ] System.Interactive.Async - breaking changes, need rework later.

[codecov[bot]]

Codecov Report

Merging #151 into master will decrease coverage by 0.65%. The diff coverage is 43.47%.

@@            Coverage Diff             @@
##           master     #151      +/-   ##
==========================================
- Coverage   81.19%   80.53%   -0.66%     
==========================================
  Files         196      196              
  Lines        7189     7230      +41     
  Branches      733      738       +5     
==========================================
- Hits         5837     5823      -14     
- Misses        981     1015      +34     
- Partials      371      392      +21     

Impacted Files	Coverage Δ
MangaReader.Core/Account/CookieClient.cs	64.10% <40.90%> (-31.55%)	:arrow_down:
MangaReader.Core/Services/DirectoryHelpers.cs	76.59% <100.00%> (+0.70%)	:arrow_up:
Sites/Acomics.ru/Convertation/From24To27.cs	71.42% <0.00%> (-8.58%)	:arrow_down:
...ngaReader.Core/Convertation/Database/From40To41.cs	55.00% <0.00%> (-8.16%)	:arrow_down:
MangaReader.Core/Convertation/Mangas/From37To38.cs	64.28% <0.00%> (-6.09%)	:arrow_down:
MangaReader.Core/Convertation/Config/From43To44.cs	78.94% <0.00%> (-5.27%)	:arrow_down:
...ests.Entities/Converter/MangaDateConverterTests.cs	89.70% <0.00%> (-4.42%)	:arrow_down:
.../Hentaichan.me/Convertation/MangachanFrom47To48.cs	58.06% <0.00%> (-4.01%)	:arrow_down:
...Hentaichan.me/Convertation/HentaichanFrom44To45.cs	75.00% <0.00%> (-3.95%)	:arrow_down:
MangaReader.Core/Convertation/Config/From47To48.cs	76.19% <0.00%> (-3.81%)	:arrow_down:
... and 27 more

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