* Add semaphore support for limiting concurrent updates
Introduce a semaphore-based mechanism to control the number of concurrent tasks in polling mode when `handle_as_tasks=True`. Added the `tasks_concurrency_limit` parameter to `start_polling()` and `run_polling()`, preventing potential memory exhaustion during high update loads.
* fix: update variable name for clarity in semaphore creation
* Update aiogram/dispatcher/dispatcher.py
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
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Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
