Add missed override for mysql

Author: maca88

src/NHibernate/Dialect/MySQLDialect.cs

@@ -497,6 +497,10 @@ protected void RegisterCastType(DbType code, int capacity, string name)
 		public override string GetCastTypeName(SqlType sqlType) =>
 			GetCastTypeName(sqlType, castTypeNames);
 
+		/// <inheritdoc />
+		public override bool TryGetCastTypeName(SqlType sqlType, out string typeName) =>
+			TryGetCastTypeName(sqlType, castTypeNames, out typeName);
+
 		public override long TimestampResolutionInTicks
 		{
 			get