certificate verification failed

I want to login and get some data from webside https://csu.septim.cz.
When i run it on PC it works great, but when i run it on RStudio Cloud i got error on first line:

session <- html_session("https://csu.septim.cz/")

Error in curl::curl_fetch_memory(url, handle = handle) :
server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none

Thanks for help

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