Bump react-sdk dep to 12.4-rc.3 (for instant sticker picker)
Bump react-sdk dep to 12.4-rc.3 (for instant sticker picker)

vector-im/riot-web,vector-im/riot-web,vector-im/riot-web,vector-im/vector-web,vector-im/vector-web,vector-im/vector-web,vector-im/vector-web,vector-im/riot-web,vector-im/riot-web,vector-im/vector-web,vector-im/riot-web