remove -k (--insecure) flag from curl

[TheSkibb]

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the -k (--insecure) flags skips the verification of whether or not the transfer is actually secure

see https://daniel.haxx.se/blog/2020/01/27/curl-ootw-k-insecure/ on why --insecure really means insecure

since the files are served from jfrogs domain it is in the users interest to know that the certificate is actually validated

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[TheSkibb]

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