Pin dependencies

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
@testing-library/jest-dom	dependencies	pin	^4.2.4 -> 4.2.4
@testing-library/react	dependencies	pin	^9.3.2 -> 9.5.0
@testing-library/user-event	dependencies	pin	^7.1.2 -> 7.2.1
react (source)	dependencies	pin	^16.12.0 -> 16.13.0
react-dom (source)	dependencies	pin	^16.12.0 -> 16.13.0
react-mde	dependencies	pin	^8.0.2 -> 8.1.0
showdown (source)	dependencies	pin	^1.9.1 -> 1.9.1

:pushpin: Important: Renovate will wait until you have merged this Pin PR before creating any upgrade PRs for the affected packages. Add the preset :preserveSemverRanges your config if you instead don't wish to pin dependencies.

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