Switch Mastodon cookbook to new Redis cookbook

Also add new node config.

refs #349

Co-authored-by Greg Karékinian <greg@karekinian.com>

site-cookbooks/kosmos-mastodon/attributes/default.rb

@@ -9,6 +9,8 @@ node.default["kosmos-mastodon"]["sidekiq_threads"] = 25
 # Allocate this amount of RAM to the Java heap for Elasticsearch
 node.default["kosmos-mastodon"]["elasticsearch"]["allocated_memory"] = "1536m"
 
+node.override["redisio"]["version"] = "6.2.6"
+
 node.override["tor"]["HiddenServices"]["mastodon"] = {
   "HiddenServicePorts" => ["80 127.0.0.1:80", "443 127.0.0.1:443"]
 }