chore: upgrade rails to 7.0 and other dependencies

app/views/messages/activity.html.haml

@@ -11,7 +11,7 @@
     - for entry in @entries.reverse
       - if entry.is_a?(Postal::MessageDB::Delivery)
         %li.messageActivity__event
-          %p.messageActivity__timestamp= entry.timestamp.to_s(:long)
+          %p.messageActivity__timestamp= entry.timestamp.to_fs(:long)
           .messageActivity__details.messageActivity--detailsDelivery
             %p.messageActivity__subject
               =# entry.status.underscore.humanize
@@ -21,20 +21,20 @@
 
       - elsif entry.is_a?(Postal::MessageDB::Click)
         %li.messageActivity__event
-          %p.messageActivity__timestamp= entry.timestamp.to_s(:long)
+          %p.messageActivity__timestamp= entry.timestamp.to_fs(:long)
           .messageActivity__details.messageActivity--detailsClick
             %p.messageActivity__subject Click for #{entry.url}
             %p.messageActivity__extra Clicked from #{entry.ip_address} (#{entry.user_agent})
 
       - elsif entry.is_a?(Postal::MessageDB::Load)
         %li.messageActivity__event
-          %p.messageActivity__timestamp= entry.timestamp.to_s(:long)
+          %p.messageActivity__timestamp= entry.timestamp.to_fs(:long)
           .messageActivity__details.messageActivity--detailsLoad
             %p.messageActivity__subject Message Viewed
             %p.messageActivity__extra Opened from #{entry.ip_address} (#{entry.user_agent})
 
     %li.messageActivity__event
-      %p.messageActivity__timestamp= @message.timestamp.to_s(:long)
+      %p.messageActivity__timestamp= @message.timestamp.to_fs(:long)
       .messageActivity__details
         %p.messageActivity__subject
           Message received by Postal