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Because the js-sdk methods are changing and there's no reason for these not to use the secure versions. The dedicated upper/lower functions were only used in this one case, so this should do the exact same thing with the one exported function.
Others were just using randomString, none look speed-sensitive so I don't think we really need to maintain an insecure set of functions too.
Requires matrix-org/matrix-js-sdk#4621 (merge both together)
Checklist
public
/exported
symbols have accurate TSDoc documentation.