irc/ircd-hybrid: Update to 8.2.47

Add libjansson as dependency.

Changes since 8.2.46:

• • Noteworthy changes in version 8.2.47 (2025-04-04)
• The general::max_away_length configuration directive has been added, allowing servers to specify the maximum length of a AWAY message that the server will accept from a client.
• The general::disable_dns configuration directive has been added, allowing servers to disable DNS lookups
• K-lines, D-lines, X-lines, and RESVs are no longer stored in binary database format. These entries are now stored in JSON format using libjansson.
• The general::ident_timeout configuration directive has been added, allowing servers to specify how long to wait for Ident replies