Symfony version(s) affected: 5.3.6 and below

Description
When sending notification to Telegram that contains any special characters from the list _ * [ ] ( ) ~` > # + - = | { } . ! , except dot which is already escaped, throws exception:

Message: "Handling "Symfony\Component\Notifier\Message\ChatMessage" failed: Unable to post the Telegram message: Bad Request: can't parse entities: Character '-' is reserved and must be escaped with the preceding '\' (code 400)

It is for default parse_mode or TelegramOptions::PARSE_MODE_MARKDOWN_V2

How to reproduce

Send a notification via telegram with any of the special characters listed above using default parse_mode or TelegramOptions::PARSE_MODE_MARKDOWN_V2

Possible Solution
In the documentation of Telegram Bot API https://core.telegram.org/bots/api#markdownv2-style we can see that we need to escape those characters. I have prepared a Regex for this which we can put here https://github.com/symfony/telegram-notifier/blob/5.3/TelegramTransport.php#L85 , replace str_replace with preg_replace that will escape those characters with \.

If you think this is a good solution please let me know, I will Pull a request.