Bump Npgsql from 8.0.3 to 8.0.4 in /by-language/csharp-npgsql

Bumps [Npgsql](https://github.com/npgsql/npgsql) from 8.0.3 to 8.0.4.
- [Release notes](https://github.com/npgsql/npgsql/releases)
- [Commits](npgsql/npgsql@v8.0.3...v8.0.4)

---
updated-dependencies:
- dependency-name: Npgsql
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

by-language/csharp-npgsql/demo.csproj

@@ -9,7 +9,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Npgsql" Version="8.0.3" />
+    <PackageReference Include="Npgsql" Version="8.0.4" />
     <PackageReference Include="CommandLineParser" Version="2.9.1" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
     <PackageReference Include="xunit" Version="2.9.1" />