CI: Use system-shipped Json-C/Botan/GnuPG when applicable.

[ni4]

Description

Currently we build Json-C/Botan/GnuPG from sources, however it would be more logical to use ones from packages if version requirements are met. Except cases where we need to check against exact GnuPG and/or Botan version.

[ronaldtse]

Agree @ni4!

[maxirmx]

CentOS/Fedora overview

      OS           botan   botan repository  json-c               json-c repository
 ----------------------------------------------------------------------------
   CentOS 7        2.16.0   ribose            json-c12 (0.12.1)   ribose
   CentOS 8        2.16.0   ribose            0.13.1              el8
   CentOS 9        2.19.3   el9               0.14                el9
   Fedora 35       2.18.2   fc35              0.15                fc35
   Fedora 36       2.19.1   fc36              0.15                fc36