Dependencies: Align dependencies with WP packages

[gziolo]

Related to https://github.com/WordPress/gutenberg/pull/28280.

This PR tries to align dependencies shared with WP components:

This PR tries to update dependencies shared with G2 components to their latest versions.

{
    "@emotion/core": "10.1.1",
    "downshift": "6.0.15",
    "react-merge-refs": "1.1.0",
    "react-resize-aware": "3.1.0",
    "react-use-gesture": "9.0.0",
    "rtlcss": "2.6.2",
    "tinycolor2": "1.4.2",
}

In addition to that, it sets all WordPress dependencies as peer dependencies to avoid accidental bundling copies of the same libraries.

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