Add ruby-rotp package version 6.2.0 required by Redmine 4.2.
The Ruby One Time Password Library
A ruby library for generating and validating one time passwords (HOTP &
TOTP) according to RFC 4226 and RFC 6238.
ROTP is compatible with Google Authenticator available for Android and
iPhone and any other TOTP based implementations.
Many websites use this for multi-factor authentication, such as GMail,
Facebook, Amazon EC2, WordPress, and Salesforce. You can find a more
complete list here:
https://en.wikipedia.org/wiki/Google_Authenticator#Usage.
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