Fix params comparison deprecation warning

```
DEPRECATION WARNING: Comparing equality between
`ActionController::Parameters` and a `Hash` is deprecated and will be
removed in Rails 7.2. Please only do comparisons between instances of
`ActionController::Parameters`. If you need to compare to a hash, first
convert it using `ActionController::Parameters#new`.
```

Author: tagliala

spec/deserialization_spec.rb

@@ -25,7 +25,8 @@ def create
     it 'makes the deserialized resource available in params' do
       post :create, params: payload
 
-      expected = { 'type' => 'users', 'name' => 'Lucas' }
+      expected = ActionController::Parameters.new('type' => 'users',
+                                                  'name' => 'Lucas')
       expect(controller.params[:user]).to eq(expected)
     end
 
@@ -54,7 +55,8 @@ def create
     it 'makes the deserialized resource available in params' do
       post :create, params: payload
 
-      expected = { 'type' => 'users', 'first_name' => 'Lucas' }
+      expected = ActionController::Parameters.new('type' => 'users',
+                                                  'first_name' => 'Lucas')
       expect(controller.params[:user]).to eq(expected)
     end
 
@@ -81,7 +83,8 @@ def create
     it 'makes the deserialized resource available in params' do
       post :create, params: payload
 
-      expected = { 'type' => 'users', 'Name' => 'Lucas' }
+      expected = ActionController::Parameters.new('type' => 'users',
+                                                  'Name' => 'Lucas')
       expect(controller.params[:user]).to eq(expected)
     end