chore: Upgrade to Ruby 3.2.1 & Rails 6.0

* chore: upgrade to rails 6.0

* chore: upgrade ruby to 3.2.1

* chore: upgrade bundler

* chore: upgrade execjs

* chore: upgrade to rails 6.1

* chore: switch to sentry-ruby from raven

* chore: add extra platforms to gemfile

lib/postal/message_parser.rb

@@ -50,8 +50,8 @@ module Postal
     rescue StandardError => e
       raise if Rails.env.development?
 
-      if defined?(Raven)
-        Raven.capture_exception(e)
+      if defined?(Sentry)
+        Sentry.capture_exception(e)
       end
       @actioned = false
       @tracked_links = 0

lib/postal/smtp_sender.rb

@@ -197,8 +197,8 @@ module Postal
         safe_rset
       rescue StandardError => e
         log "#{e.class}: #{e.message}"
-        if defined?(Raven)
-          Raven.capture_exception(e, extra: { log_id: @log_id, server_id: message.server.id, message_id: message.id })
+        if defined?(Sentry)
+          Sentry.capture_exception(e, extra: { log_id: @log_id, server_id: message.server.id, message_id: message.id })
         end
         result.type = "SoftFail"
         result.retry = true

lib/postal/smtp_server/server.rb

@@ -113,8 +113,8 @@ module Postal
                 monitor.value = client
               rescue StandardError => e
                 # If something goes wrong, log as appropriate and disconnect the client
-                if defined?(Raven)
-                  Raven.capture_exception(e, extra: { log_id: begin
+                if defined?(Sentry)
+                  Sentry.capture_exception(e, extra: { log_id: begin
                     client.id
                   rescue StandardError
                     nil
@@ -227,8 +227,8 @@ module Postal
               rescue StandardError => e
                 # Something went wrong, log as appropriate
                 client_id = client ? client.id : "------"
-                if defined?(Raven)
-                  Raven.capture_exception(e, extra: { log_id: begin
+                if defined?(Sentry)
+                  Sentry.capture_exception(e, extra: { log_id: begin
                     client.id
                   rescue StandardError
                     nil

lib/postal/tracking_middleware.rb

@@ -44,7 +44,7 @@ module Postal
       rescue StandardError => e
         # Somethign else went wrong. We don't want to stop the image loading though because
         # this is our problem. Log this exception though.
-        Raven.capture_exception(e) if defined?(Raven)
+        Sentry.capture_exception(e) if defined?(Sentry)
       end
 
       source_image = request.params["src"]

lib/postal/worker.rb

@@ -69,8 +69,8 @@ module Postal
           e.backtrace.each do |line|
             logger.warn "[#{message['id']}]    " + line
           end
-          if defined?(Raven)
-            Raven.capture_exception(e, extra: { job_id: message["id"] })
+          if defined?(Sentry)
+            Sentry.capture_exception(e, extra: { job_id: message["id"] })
           end
         ensure
           logger.info "[#{message['id']}] Finished processing \e[34m#{message['class_name']}\e[0m job in #{Time.now - start_time}s"