Bug XF\EmailBounce\Parser::getBounceTypeFromStatus does not handle statuses with multiple digits

[DragonByte Tech]

Amazon SES will sometimes send a status such as 5.1.10, which will explicitly fail on this regex:
PHP:

if (!$statusCode || !preg_match('#^\d\.\d\.\d$#', $statusCode))

Suggested fix:
PHP:

if (!$statusCode || !preg_match('#^\d+\.\d+\.\d+$#', $statusCode))

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