Update dependency Kingfisher to v7

Author: renovate[bot]

Podfile

@@ -11,7 +11,7 @@ target 'Search Book' do
   pod 'Alamofire', '~> 4.8.2'
   pod 'RxAlamofire', '~> 5.0.0'
 
-  pod 'Kingfisher', '~> 5.7.0'
+  pod 'Kingfisher', '~> 7.6.0'
   pod 'MaterialComponents/Snackbar', '~> 86.0.0'
   pod 'MaterialComponents/Buttons', '~> 86.0.0'