Delete obsolete features

[Yang-33]

• GET /v2/bot/audienceGroup/authorityLevel
• PUT /v2/bot/audienceGroup/authorityLevel

have been obsolete from 2025-03-26. Let's delete it. https://developers.line.biz/ja/news/2025/03/26/cross-targeting-closing/

[Yang-33]

after merging this, please merge auto-made changes in each bot-sdk repository, and release it.
note line-bot-sdk-ruby is still in development, so we don't have to release changes only in the repository.

[Yang-33]

releaser: @eucyt