Update dependency FirebaseFirestore to ~> 11.6.0

Author: renovate[bot]

Diff for: app/ios/Podfile

@@ -9,7 +9,7 @@ target 'grodno-roads-ios' do
    pod 'FirebaseDatabase', '~> 11.1.0'
    pod 'FirebaseAnalytics', '~> 11.1.0'
    pod 'FirebaseCrashlytics', '~> 11.1.0'
-   pod 'FirebaseFirestore', '~> 11.1.0'
+   pod 'FirebaseFirestore', '~> 11.6.0'
    pod 'root', :path => '../../kmp/features/root'
 end