Disable verify client keys by default for older compatibility

This also mimics the default vanilla configuration.

core/src/main/resources/config.yml

@@ -277,9 +277,9 @@ floodgatePrefixWorkaround: false
 # is necessary for servers where you or other in-game players want to verify that a chat message sent and signed by
 # this player is not modified by any third-party. Modifications by your server would also invalidate the message.
 #
-# This feature is only relevant if you use the plugin in ProtocolLib mode. This also the case if you don't have any
-# proxies in use.
-verifyClientKeys: true
+# This feature is only relevant if you use the plugin in ProtocolLib mode and use 1.19+.
+# This also the case if you don't have any proxies in use.
+verifyClientKeys: false
 
 # Database configuration
 # Recommended is the use of MariaDB (a better version of MySQL)