Use ddtrace 0.47.0 b/c build issues (#13570)

Gemfile

@@ -23,7 +23,7 @@ gem "carrierwave", "~> 2.2" # Upload files in your Ruby applications, map them t
 gem "carrierwave-bombshelter", "~> 0.2" # Protect your carrierwave from image bombs
 gem "cloudinary", "~> 1.20" # Client library for easily using the Cloudinary service
 gem "counter_culture", "~> 2.8" # counter_culture provides turbo-charged counter caches that are kept up-to-date
-gem "ddtrace", "~> 0.48.0" # ddtrace is Datadog’s tracing client for Ruby.
+gem "ddtrace", "~> 0.47.0" # ddtrace is Datadog’s tracing client for Ruby.
 gem "devise", github: "heartcombo/devise", ref: "0cd72a5" # Flexible authentication solution for Rails
 gem "devise_invitable", "~> 2.0.5" # Allows invitations to be sent for joining
 gem "dogstatsd-ruby", "~> 4.8" # A client for DogStatsD, an extension of the StatsD metric server for Datadog

Gemfile.lock

@@ -195,8 +195,7 @@ GEM
       puma (>= 3.8.0)
       railties (>= 5.2.0)
     dante (0.2.0)
-    ddtrace (0.48.0)
-      ffi (~> 1.0)
+    ddtrace (0.47.0)
       msgpack
     dead_end (1.1.6)
     debug_inspector (1.1.0)
@@ -882,7 +881,7 @@ DEPENDENCIES
   cloudinary (~> 1.20)
   counter_culture (~> 2.8)
   cypress-rails (~> 0.5.0)
-  ddtrace (~> 0.48.0)
+  ddtrace (~> 0.47.0)
   derailed_benchmarks (~> 2.0)
   devise!
   devise_invitable (~> 2.0.5)