chore: release 1.21.6

[kirillzyusko]

Release

Version 1.21.6

[github-actions]

📊 Package size report

Current size	Target Size	Difference
312781 bytes	312781 bytes	0 bytes 📉

[github-actions]

1. Version Bump Without Code Changes
   Why: The version number in package.json was incremented from 1.21.5 to 1.21.6, but no code files were modified in the PR. This could cause confusion for users expecting new features or changes.
   Fix: Ensure that version bumps are accompanied by corresponding code changes or documentation updates.

2. Missing Code Context
   Why: Without reviewing actual code changes, it's impossible to assess if this version bump introduces any runtime errors or incorrect behavior.
   Fix: Provide the relevant code files modified in this release for proper review.

LGTM