chore: Upgrade rails and ruby versions (#2400)

ruby version: 3.0.2
rails version: 6.1.4

db/migrate/20200418124534_add_sender_to_messages.rb

@@ -15,9 +15,7 @@ class AddSenderToMessages < ActiveRecord::Migration[6.0]
         # rubocop:disable Rails/SkipsModelValidations
         message.update_columns(sender_id: message.user.id, sender_type: 'User') if message.user.present?
         message.update_columns(sender_id: message.contact.id, sender_type: 'Contact') if message.contact.present?
-        if message.sender.nil?
-          message.update_columns(sender_id: message.conversation.contact.id, sender_type: 'Contact') if message.incoming?
-        end
+        message.update_columns(sender_id: message.conversation.contact.id, sender_type: 'Contact') if message.sender.nil? && message.incoming?
         # rubocop:enable Rails/SkipsModelValidations
       end
     end

db/migrate/20210611180221_add_service_name_to_active_storage_blobs.active_storage.rb

@@ -0,0 +1,18 @@
+# This migration comes from active_storage (originally 20190112182829)
+class AddServiceNameToActiveStorageBlobs < ActiveRecord::Migration[6.0]
+  def up
+    unless column_exists?(:active_storage_blobs, :service_name)
+      add_column :active_storage_blobs, :service_name, :string
+
+      if configured_service = ActiveStorage::Blob.service.name
+        ActiveStorage::Blob.unscoped.update_all(service_name: configured_service)
+      end
+
+      change_column :active_storage_blobs, :service_name, :string, null: false
+    end
+  end
+
+  def down
+    remove_column :active_storage_blobs, :service_name
+  end
+end

db/migrate/20210611180222_create_active_storage_variant_records.active_storage.rb

@@ -0,0 +1,12 @@
+# This migration comes from active_storage (originally 20191206030411)
+class CreateActiveStorageVariantRecords < ActiveRecord::Migration[6.0]
+  def change
+    create_table :active_storage_variant_records do |t|
+      t.belongs_to :blob, null: false, index: false
+      t.string :variation_digest, null: false
+
+      t.index %i[blob_id variation_digest], name: 'index_active_storage_variant_records_uniqueness', unique: true
+      t.foreign_key :active_storage_blobs, column: :blob_id
+    end
+  end
+end