fix(deps, ios): FirebaseCoreExtension is not always versioned

for the 10.23.1 patch release, only a few podspecs were versioned
upstream, and FirebaseCoreExtension was not one of them, it remained
on 10.23.0

If we let that dependency version resolve via semantic specifiers from
FirebaseCore's podspec it will get `~> 10` which is adequate for our purposes
and is in fact how they reference this pod upstream, so the fix is to just
remove the version here and let other specifiers drive the version

Author: mikehardy

packages/crashlytics/RNFBCrashlytics.podspec

@@ -39,7 +39,7 @@ Pod::Spec.new do |s|
 
   # Firebase dependencies
   s.dependency          'Firebase/Crashlytics', firebase_sdk_version
-  s.dependency          'FirebaseCoreExtension', firebase_sdk_version
+  s.dependency          'FirebaseCoreExtension'
 
   if defined?($RNFirebaseAsStaticFramework)
     Pod::UI.puts "#{s.name}: Using overridden static_framework value of '#{$RNFirebaseAsStaticFramework}'"

packages/messaging/RNFBMessaging.podspec

@@ -39,7 +39,7 @@ Pod::Spec.new do |s|
 
   # Firebase dependencies
   s.dependency          'Firebase/Messaging', firebase_sdk_version
-  s.dependency          'FirebaseCoreExtension', firebase_sdk_version
+  s.dependency          'FirebaseCoreExtension'
 
   if defined?($RNFirebaseAsStaticFramework)
     Pod::UI.puts "#{s.name}: Using overridden static_framework value of '#{$RNFirebaseAsStaticFramework}'"