USN-5806-3: Ruby vulnerability

USN-5806-1 fixed vulnerabilities in Ruby. This update fixes the problem
for Ubuntu 20.04 LTS.

Original advisory details:

Hiroshi Tokumaru discovered that Ruby did not properly handle certain
user input for applications which generate HTTP responses using cgi gem.
An attacker could possibly use this issue to maliciously modify the
response a user would receive from a vulnerable application.

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