breaking feat: adopt styled-components v6

[quantizor]

This PR relies on styled-components/styled-components#4307 (currently published under the test tag) released

To test this:

yarn add @xstyled/styled-components@beta styled-components@^6.1.11

TODO:

• resolve typing error when using <x.*> (something about invalid children)

[quantizor]

Alright I'm annoyed by lerna, I cannot for the life of me figure out how to only do a major bump for @xstyled/styled-components. No matter how I organize the commits it always bumps all of the packages even though I changed the versioning strategy to independent 😠

Edit: Manually bumping the version and yarn lerna publish from-package --conventional-commits did it