Added support for Amazon SES's 3 new regions, namely Canada, London and Sao Paulo, in addition to the current N. Virginia, Oregon, Ireland, Mumbai, Sydney and Frankfurt regions.
Please note that Amazon SES 'regions' have no relation with where you are physically located. Anyone in the world can use Amazon SES. It only matters where your web hosting server is located. For example, if you're hosting Sendy on a hosting server situated in Canada, use Amazon SES in 'Canada' region and you will get the fastest sending speed.
Fixed warning “Array and string offset access syntax with curly braces is deprecated” for PHP 7.4+ in CSV parsing code
