Infrastructure security improvements

The infrastructure team would like to acknowledge the work of security
researcher Joël Aviad Ossi from pentest in helping us
improve some security weaknesses in our infrastructure. No user data was at
risk nor were our downloads vulnerable at any time; this is simply a note of
appreciation rather than a disclosure.

Thanks Joël for your assistance. Anyone with security concerns about the
project is always welcome to contact the team directly through the email link
at https://www.phpmyadmin.net/security/.

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