config: drop unused duplicate finch pool timeout config

This was added in a924e117fd
with its name mirroring Finch’s own config option, but with
pool_timeout such a setting already existed since
2fe1484ed3 and the new one
was never actually used.

CHANGELOG.md

@@ -35,6 +35,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - ActivityPub delivery attempts are spaced out more giving up after 3h instead of ~20min before
 - inboxes now fake a succcess reply on incoming Delete documents whose signing key is unknown but gone;
   this prevents older Mastodon from repeatedly trying to deliver Deletes of actors we never knew anyway
+- The config option `config :pleroma, :http, :pool_max_idle_time` was removed; it never actually
+  did anything and was redundant with `config :pleroma, :http, :pool_timeout` which actually works.
 
 ## 2025.03
 

config/config.exs

@@ -186,9 +186,7 @@
   proxy_url: nil,
   user_agent: :default,
   pool_size: 10,
-  adapter: [],
-  # see: https://hexdocs.pm/finch/Finch.html#start_link/1
-  pool_max_idle_time: :timer.seconds(30)
+  adapter: []
 
 config :pleroma, :instance,
   name: "Akkoma",