Update dependency @types/sanitize-html to v2.8.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@types/sanitize-html (source)	2.6.2 -> 2.8.0

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[andybalaam]

Logged DefinitelyTyped/DefinitelyTyped#64302

[t3chguy]

@andybalaam I don't think this is right due to the code package still being v2.7.3

https://github.com/matrix-org/matrix-react-sdk/blob/develop/yarn.lock#L7866

[andybalaam]

OK. I was assuming that renovate wouldn't do something wrong but I guess that was not right. I'll revert unless we can get #9766 over the line.

[andybalaam]

Addressed in 03e4b96