Upgrade Npgsql to a non vulnerable version (#3545)

Co-authored-by: Alex Zaytsev <hazzik@gmail.com>

Author: fredericDelaporte

src/NHibernate.Test/ExceptionsTest/PostgresExceptionConverterExample.cs

@@ -1,6 +1,6 @@
 using System;
-using System.Data.Common;
 using NHibernate.Exceptions;
+using Npgsql;
 
 namespace NHibernate.Test.ExceptionsTest
 {
@@ -10,23 +10,23 @@ public class PostgresExceptionConverterExample : ISQLExceptionConverter
 
 		public Exception Convert(AdoExceptionContextInfo exInfo)
 		{
-			var sqle = ADOExceptionHelper.ExtractDbException(exInfo.SqlException) as DbException;
-			if (sqle != null)
+			if (ADOExceptionHelper.ExtractDbException(exInfo.SqlException) is PostgresException pge)
 			{
-				string code = (string)sqle.GetType().GetProperty("Code").GetValue(sqle, null);
-
+				string code = pge.SqlState;
 				if (code == "23503")
 				{
-					return new ConstraintViolationException(exInfo.Message, sqle.InnerException, exInfo.Sql, null);
+					return new ConstraintViolationException(exInfo.Message, pge.InnerException, exInfo.Sql, null);
 				}
+
 				if (code == "42P01")
 				{
-					return new SQLGrammarException(exInfo.Message, sqle.InnerException, exInfo.Sql);
+					return new SQLGrammarException(exInfo.Message, pge.InnerException, exInfo.Sql);
 				}
 			}
+
 			return SQLStateConverter.HandledNonSpecificException(exInfo.SqlException, exInfo.Message, exInfo.Sql);
 		}
 
 		#endregion
 	}
-}
+}

src/NHibernate.Test/NHibernate.Test.csproj

@@ -66,7 +66,7 @@
     <PackageReference Include="NUnit3TestAdapter" Version="4.4.2" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.0.0" />
     <PackageReference Include="FirebirdSql.Data.FirebirdClient" Version="8.5.2" />
-    <PackageReference Include="Npgsql" Version="6.0.6" />
+    <PackageReference Include="Npgsql" Version="8.0.3" />
     <PackageReference Include="MySql.Data" Version="8.0.30" />
   </ItemGroup>
   <ItemGroup Condition="$(NhNetFx)">