chore: Upgrade rails and ruby versions (#2400)

ruby version: 3.0.2
rails version: 6.1.4

db/schema.rb

@@ -2,8 +2,8 @@
 # of editing this file, please use the migrations feature of Active Record to
 # incrementally modify your database, and then regenerate this schema definition.
 #
-# This file is the source Rails uses to define your schema when running `rails
-# db:schema:load`. When creating a new database, `rails db:schema:load` tends to
+# This file is the source Rails uses to define your schema when running `bin/rails
+# db:schema:load`. When creating a new database, `bin/rails db:schema:load` tends to
 # be faster and is potentially less error prone than running all of your
 # migrations from scratch. Old migrations may fail to apply correctly if those
 # migrations use external dependencies or application code.
@@ -79,9 +79,16 @@ ActiveRecord::Schema.define(version: 2021_07_23_095657) do
     t.bigint "byte_size", null: false
     t.string "checksum", null: false
     t.datetime "created_at", null: false
+    t.string "service_name", null: false
     t.index ["key"], name: "index_active_storage_blobs_on_key", unique: true
   end
 
+  create_table "active_storage_variant_records", force: :cascade do |t|
+    t.bigint "blob_id", null: false
+    t.string "variation_digest", null: false
+    t.index ["blob_id", "variation_digest"], name: "index_active_storage_variant_records_uniqueness", unique: true
+  end
+
   create_table "agent_bot_inboxes", force: :cascade do |t|
     t.integer "inbox_id"
     t.integer "agent_bot_id"
@@ -685,6 +692,7 @@ ActiveRecord::Schema.define(version: 2021_07_23_095657) do
   add_foreign_key "account_users", "accounts"
   add_foreign_key "account_users", "users"
   add_foreign_key "active_storage_attachments", "active_storage_blobs", column: "blob_id"
+  add_foreign_key "active_storage_variant_records", "active_storage_blobs", column: "blob_id"
   add_foreign_key "agent_bots", "accounts"
   add_foreign_key "campaigns", "accounts"
   add_foreign_key "campaigns", "inboxes"