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
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