Automated g4 rollback of changelist 266264551.

*** Reason for rollback ***

This breaks Performance Monitoring and Remote Config iOS builds due to their dependency upon A/B testing.  The A/B testing framework no longer has a binary framework which means that the snapshot no longer works since it doesn't pull in a snapshot of the source :/

So _someone_ is going to have to unravel this so we can update pods for the next release.  Also it won't be able to build Firebase Installations from a snapshot of the iOS release (i.e will require the blaze flag "--define firebase_build=head") until this is resolved.

*** Original change description ***

Update pods to 6.7.0

***

PiperOrigin-RevId: 266272837

Author: smiles

version.sh

@@ -18,9 +18,9 @@
 
 # Used to generate Pod dependencies in the Firebase Unity plugin.
 declare -A POD_SDK_VERSIONS=(
-  ["released"]="6.7.0"  # gen_build.sh: [FIR] Managed by a script. DO NOT EDIT.
-  ["stable"]="6.7.0"  # gen_build.sh: [FIR] Managed by a script. DO NOT EDIT.
-  ["head"]="6.7.0"  # gen_build.sh: [FIR] Managed by a script. DO NOT EDIT.
+  ["released"]="6.6.0"  # gen_build.sh: [FIR] Managed by a script. DO NOT EDIT.
+  ["stable"]="6.6.0"  # gen_build.sh: [FIR] Managed by a script. DO NOT EDIT.
+  ["head"]="6.6.0"  # gen_build.sh: [FIR] Managed by a script. DO NOT EDIT.
 )
 
 help() {