Make rekeys happen once an hour, as recommended

ssh-session.rkt

@@ -134,7 +134,7 @@
 (define client-preamble-lines (make-parameter '()))
 (define client-identification-string (make-parameter "SSH-2.0-RacketSSH_0.0"))
 
-(define rekey-interval (make-parameter 60)) ;;3600))
+(define rekey-interval (make-parameter 3600))
 (define rekey-volume (make-parameter 1000000000))
 
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