[Release] Update versions for Release 10.21.0 (#12288)

FirebaseAnalytics.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
     s.name             = 'FirebaseAnalytics'
-    s.version          = '10.20.0'
+    s.version          = '10.21.0'
     s.summary          = 'Firebase Analytics for iOS'
 
     s.description      = <<-DESC
@@ -37,12 +37,12 @@ Pod::Spec.new do |s|
     s.default_subspecs = 'AdIdSupport'
 
     s.subspec 'AdIdSupport' do |ss|
-        ss.dependency 'GoogleAppMeasurement', '10.20.0'
+        ss.dependency 'GoogleAppMeasurement', '10.21.0'
         ss.vendored_frameworks = 'Frameworks/FirebaseAnalytics.xcframework'
     end
 
     s.subspec 'WithoutAdIdSupport' do |ss|
-        ss.dependency 'GoogleAppMeasurement/WithoutAdIdSupport', '10.20.0'
+        ss.dependency 'GoogleAppMeasurement/WithoutAdIdSupport', '10.21.0'
         ss.vendored_frameworks = 'Frameworks/FirebaseAnalytics.xcframework'
     end