Update sentry-raven 2.5.3 -> 2.7 (Fixes #24029)

Gemfile

@@ -264,7 +264,7 @@ gem 'virtus', '~> 1.0.1'
 gem 'base32', '~> 0.3.0'
 # Sentry integration
-gem 'sentry-raven', '~> 2.5.3'
+gem 'sentry-raven', '~> 2.7'
 gem 'premailer-rails', '~> 1.9.7'

Gemfile.lock

@@ -844,7 +844,7 @@ GEM
     selenium-webdriver (3.5.0)
       childprocess (~> 0.5)
       rubyzip (~> 1.0)
-    sentry-raven (2.5.3)
+    sentry-raven (2.7.2)
       faraday (>= 0.7.6, < 1.0)
     settingslogic (2.0.9)
     sexp_processor (4.9.0)
@@ -1183,7 +1183,7 @@ DEPENDENCIES
   seed-fu (~> 2.3.7)
   select2-rails (~> 3.5.9)
   selenium-webdriver (~> 3.5)
-  sentry-raven (~> 2.5.3)
+  sentry-raven (~> 2.7)
   settingslogic (~> 2.0.9)
   sham_rack (~> 1.3.6)
   shoulda-matchers (~> 3.1.2)