Autofix Rubocop Rails/ResponseParsedBody (#24051)

spec/controllers/follower_accounts_controller_spec.rb

@@ -41,7 +41,7 @@ describe FollowerAccountsController do
     context 'when format is json' do
       subject(:response) { get :index, params: { account_username: alice.username, page: page, format: :json } }
 
-      subject(:body) { JSON.parse(response.body) }
+      subject(:body) { response.parsed_body }
 
       context 'with page' do
         let(:page) { 1 }

spec/controllers/following_accounts_controller_spec.rb

@@ -41,7 +41,7 @@ describe FollowingAccountsController do
     context 'when format is json' do
       subject(:response) { get :index, params: { account_username: alice.username, page: page, format: :json } }
 
-      subject(:body) { JSON.parse(response.body) }
+      subject(:body) { response.parsed_body }
 
       context 'with page' do
         let(:page) { 1 }

spec/controllers/settings/two_factor_authentication/webauthn_credentials_controller_spec.rb

@@ -140,7 +140,7 @@ describe Settings::TwoFactorAuthentication::WebauthnCredentialsController do
           it 'includes existing credentials in list of excluded credentials' do
             get :options
 
-            excluded_credentials_ids = JSON.parse(response.body)['excludeCredentials'].pluck('id')
+            excluded_credentials_ids = response.parsed_body['excludeCredentials'].pluck('id')
             expect(excluded_credentials_ids).to match_array(user.webauthn_credentials.pluck(:external_id))
           end
         end