Merging the 7.6.0 release into master (#7488)

* Update versions for Release 7.6.0

* Cherry-pick change to fix binary image race condition. (#7477)

* Cherry-pick change to fix binary image race condition.

* Change log

Co-authored-by: elenadoty <elenadoty@google.com>

FirebaseABTesting.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name             = 'FirebaseABTesting'
-  s.version          = '7.5.0'
+  s.version          = '7.6.0'
   s.summary          = 'Firebase ABTesting'
 
   s.description      = <<-DESC