Bump Npgsql in /frameworks/CSharp/aspnetcore-mono/Benchmarks

Bumps Npgsql from 4.1.4 to 8.0.3.

---
updated-dependencies:
- dependency-name: Npgsql
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>

frameworks/CSharp/aspnetcore-mono/Benchmarks/Benchmarks.csproj

@@ -25,6 +25,7 @@
 
     <PackageReference Include="Dapper" Version="2.0.90" />
     <PackageReference Include="MySqlConnector" Version="1.0.1" />
+    <PackageReference Include="Npgsql" Version="8.0.3" />
     <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="5.0.0-rc1" />
     <PackageReference Include="System.IO.Pipelines" Version="5.0.0-rc.1.20451.14" />
   </ItemGroup>