Update dependency @testing-library/jest-dom to v6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@testing-library/jest-dom	^5.16.5 -> ^6.0.0

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Release Notes

testing-library/jest-dom (@​testing-library/jest-dom)

v6.0.0

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Features

• local types, supporting jest, @​jest/globals, vitest (#​511) (4b764b9)

BREAKING CHANGES

• Removes the extend-expect script. Users should use
  the default import path or one of the new test platform-specific
  paths to automatically extend the appropriate "expect" instance.

extend-expect was not documented in the Readme, so this change should
have minimal impact.

Users can now use the following import paths to automatically extend
"expect" for their chosen test platform:

• @​testing-library/jest-dom - jest (@​types/jest)
• @​testing-library/jest-dom/jest-globals - @​jest/globals
• @​testing-library/jest-dom/vitest - vitest

For example:

import '@​testing-library/jest-dom/jest-globals'

Importing from one of the above paths will augment the appropriate
matcher interface for the given test platform, assuming the import
is done in a .ts file that is included in the user's tsconfig.json.

It's also (still) possible to import the matchers directly without
side effects:

import * as matchers from '@​testing-library/jest-dom/matchers'

• Update kcd-scripts
• Drop node < 14

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