Bump Npgsql to 9.0.4 (#504)

Author: renovate[bot]

tests/Repositories.PostgreSQL.Tests/Repositories.PostgreSQL.Tests.csproj

@@ -5,7 +5,7 @@
     <CoverletOutputFormat>opencover</CoverletOutputFormat>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Npgsql" Version="9.0.3" />
+    <PackageReference Include="Npgsql" Version="9.0.4" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.0" />
     <PackageReference Include="xunit.v3" Version="3.1.0" />
     <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5">