Update dependency python-telegram-bot to v21 - autoclosed

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
python-telegram-bot (source, changelog)	^20.0 -> ^21.0

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Release Notes

python-telegram-bot/python-telegram-bot (python-telegram-bot)

v21.0.1

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==============

Released 2024-03-06

This is the technical changelog for version 21.0.1. More elaborate release notes can be found in the news channel @pythontelegrambotchannel <https://t.me/pythontelegrambotchannel>__.

Bug Fixes

• Remove docs from Package (:pr:4150)

v21.0

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============

Released 2024-03-06

This is the technical changelog for version 21.0. More elaborate release notes can be found in the news channel @pythontelegrambotchannel <https://t.me/pythontelegrambotchannel>__.

Major Changes

• Remove Functionality Deprecated in API 7.0 (:pr:4114 closes :issue:4099)
• API 7.1 (:pr:4118)

New Features

• Add Parameter media_write_timeout to HTTPXRequest and Method ApplicationBuilder.media_write_timeout (:pr:4120 closes :issue:3864)
• Handle Properties in TelegramObject.__setstate__ (:pr:4134 closes :issue:4111)

Bug Fixes

• Add Missing Slot to Updater (:pr:4130 closes :issue:4127)

Documentation Improvements

• Improve HTML Download of Documentation (:pr:4146 closes :issue:4050)
• Documentation Improvements (:pr:4109, :issue:4116)
• Update Copyright to 2024 (:pr:4121 by @aelkheir <https://github.com/aelkheir>__ closes :issue:4041)

Internal Changes

• Apply pre-commit Checks More Widely (:pr:4135)
• Refactor and Overhaul test_official (:pr:4087 closes :issue:3874)
• Run Unit Tests in PRs on Requirements Changes (:pr:4144)
• Make Updater.stop Independent of CancelledError (:pr:4126)

Dependency Updates

• Relax Upper Bound for httpx Dependency (:pr:4148)
• Bump test-summary/action from 2.2 to 2.3 (:pr:4142)
• Update cachetools requirement from ~=5.3.2 to ~=5.3.3 (:pr:4141)
• Update httpx requirement from ~=0.26.0 to ~=0.27.0 (:pr:4131)

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