Bump version to 3.21.0 and update changelog

CHANGES/1633.doc.rst

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-Added documentation for changing state of another user in FSM

CHANGES/1672.bugfix.rst

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-Fixed an issue where the scene entry handler (:code:`enter`) was not receiving data
-passed to the context by middleware, which could result in a :code:`TypeError`.
-
-Also updated the documentation to clarify how to enter the scene.

CHANGES/1677.misc.rst

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-Fixed MyPy [return-value] error in `InlineKeyboardBuilder().as_markup()`.
-`as_markup` method now overloads parent class method and uses `super()`, to call parent's 
-`as_markup` method.
-Also added correct type hint to `as_markup`'s return in `InlineKeyboardBuilder` and 
-`ReplyKeyboardBuilder` classes.

CHANGES/1681.misc.rst

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-Changed Babel's pinned version from minor to major.

CHANGES/1683.feature.rst

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-Refactor methods input types to calm down MyPy. #1682
-
-`Dict[str, Any]` is replaced with `Mapping[str, Any]` in the following methods:
-
-- `FSMContext.set_data`
-- `FSMContext.update_data`
-- `BaseStorage.set_data`
-- `BaseStorage.update_data`
-- `BaseStorage's child methods`
-- `SceneWizard.set_data`
-- `SceneWizard.update_data`

CHANGES/1685.feature.rst

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-Add support for `State` type in scenes methods like `goto`, `enter`, `get`

CHANGES/1694.bugfix.rst

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-Correctly pass error message in TelegramMigrateToChat.

CHANGES/1700.misc.rst

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-Increased max :code:`aiohttp` version support from “<3.12” to “<3.13”

CHANGES/1704.feature.rst

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-Added full support for the `Bot API 9.1 <https://core.telegram.org/bots/api-changelog#july-3-2025>`_:
-
-**Checklists**
-
-- Added the class :class:`aiogram.types.checklist_task.ChecklistTask` representing a task in a checklist.
-- Added the class :class:`aiogram.types.checklist.Checklist` representing a checklist.
-- Added the class :class:`aiogram.types.input_checklist_task.InputChecklistTask` representing a task to add to a checklist.
-- Added the class :class:`aiogram.types.input_checklist.InputChecklist` representing a checklist to create.
-- Added the field :code:`checklist` to the classes :class:`aiogram.types.message.Message` and :class:`aiogram.types.external_reply_info.ExternalReplyInfo`, describing a checklist in a message.
-- Added the class :class:`aiogram.types.checklist_tasks_done.ChecklistTasksDone` and the field :code:`checklist_tasks_done` to the class :class:`aiogram.types.message.Message`, describing a service message about status changes for tasks in a checklist (i.e., marked as done/not done).
-- Added the class :class:`aiogram.types.checklist_tasks_added.ChecklistTasksAdded` and the field :code:`checklist_tasks_added` to the class :class:`aiogram.types.message.Message`, describing a service message about the addition of new tasks to a checklist.
-- Added the method :class:`aiogram.methods.send_checklist.SendChecklist`, allowing bots to send a checklist on behalf of a business account.
-- Added the method :class:`aiogram.methods.edit_message_checklist.EditMessageChecklist`, allowing bots to edit a checklist on behalf of a business account.
-
-**Gifts**
-
-- Added the field :code:`next_transfer_date` to the classes :class:`aiogram.types.owned_gift_unique.OwnedGiftUnique` and :class:`aiogram.types.unique_gift_info.UniqueGiftInfo`.
-- Added the field :code:`last_resale_star_count` to the class :class:`aiogram.types.unique_gift_info.UniqueGiftInfo`.
-- Added "resale" as the possible value of the field :code:`origin` in the class :class:`aiogram.types.unique_gift_info.UniqueGiftInfo`.
-
-**General**
-
-- Increased the maximum number of options in a poll to 12.
-- Added the method :class:`aiogram.methods.get_my_star_balance.GetMyStarBalance`, allowing bots to get their current balance of Telegram Stars.
-- Added the class :class:`aiogram.types.direct_message_price_changed.DirectMessagePriceChanged` and the field :code:`direct_message_price_changed` to the class :class:`aiogram.types.message.Message`, describing a service message about a price change for direct messages sent to the channel chat.