Bump Microsoft.AspNetCore.OpenApi from 8.0.20 to 8.0.21 (#71)

---
updated-dependencies:
- dependency-name: Microsoft.AspNetCore.OpenApi
  dependency-version: 8.0.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]

PdfGenerator/PdfGenerator.csproj

@@ -8,7 +8,7 @@
 
     <ItemGroup>
         <PackageReference Include="LuaCSharp" Version="0.4.2" />
-        <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="8.0.20" />
+        <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="8.0.21" />
         <PackageReference Include="Microsoft.Extensions.Hosting.Systemd" Version="9.0.9" />
         <PackageReference Include="Newtonsoft.Json" Version="13.0.4" />
         <PackageReference Include="Sentry.AspNetCore" Version="5.15.1" />