chore(main): release 6.21.0

[gravity-ui-bot]

:robot: I have created a release beep boop

6.21.0 (2024-07-04)

Features

• Select: new label and value resize behaviour (#1694) (891fa88)
• useControlledState: support update callback with additional params (#1688) (8bff882)
• useResizeObserver: support box option (#1687) (a178dff)

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[gravity-ui-bot]

Preview is ready.

[gravity-ui-bot]

Visual Tests Report is ready.