Downgrade Npgsql package version to 8.0.3 (#151)

Author: glen-84

src/PostgreSql/PostgreSql.csproj

@@ -4,7 +4,7 @@
     <AssemblyName>Squadron.PostgreSql</AssemblyName>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Npgsql" Version="9.0.2" />
+    <PackageReference Include="Npgsql" Version="8.0.3" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\Core\Core.csproj" />