fixup! Use NuGet for database tests when possible

 * Npgsql 3.2.5 fails with distributed tests, back to 3.2.4.1

Author: fredericDelaporte

src/NHibernate.Test/NHibernate.Test.csproj

@@ -36,7 +36,7 @@
     <PackageReference Include="FirebirdSql.Data.FirebirdClient" Version="5.11.0" />
     <PackageReference Include="log4net" Version="2.0.8" />
     <PackageReference Include="MySql.Data" Version="6.9.10" />
-    <PackageReference Include="Npgsql" Version="3.2.5" />
+    <PackageReference Include="Npgsql" Version="3.2.4.1" />
     <PackageReference Include="nunit" Version="3.7.1" />
     <PackageReference Include="System.Data.SQLite.Core" Version="1.0.105.2" />
     <PackageReference Include="System.Linq.Dynamic.Core" Version="1.0.7.6" />