Upgrading Rspec-rails to use master due to rspec/rspec-rails#2086

Instructions from rails/rails#35417 (comment)

Author: maximumtiu

Gemfile

@@ -40,7 +40,11 @@ gem 'activeadmin'
 group :development, :test do
   # Call 'byebug' anywhere in the code to stop execution and get a debugger console
   gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
-  gem 'rspec-rails'
+  gem 'rspec-rails', git: 'https://github.com/rspec/rspec-rails', branch: '4-0-dev'
+  gem 'rspec-core', git: 'https://github.com/rspec/rspec-core'
+  gem 'rspec-mocks', git: 'https://github.com/rspec/rspec-mocks'
+  gem 'rspec-support', git: 'https://github.com/rspec/rspec-support'
+  gem 'rspec-expectations', git: 'https://github.com/rspec/rspec-expectations'
 end
 
 group :development do

Gemfile.lock

@@ -1,3 +1,46 @@
+GIT
+  remote: https://github.com/rspec/rspec-core
+  revision: 77dbc84657c5dc45e07a7fe0f5b02b4caeb6c9ad
+  specs:
+    rspec-core (3.9.0.pre)
+      rspec-support (= 3.9.0.pre)
+
+GIT
+  remote: https://github.com/rspec/rspec-expectations
+  revision: 75f5cc9cab09fd0728bcf95e26d2c4b46f73c466
+  specs:
+    rspec-expectations (3.9.0.pre)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (= 3.9.0.pre)
+
+GIT
+  remote: https://github.com/rspec/rspec-mocks
+  revision: 2aab10d3e7a9c1c500acd1e88a7a408670f8cc48
+  specs:
+    rspec-mocks (3.9.0.pre)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (= 3.9.0.pre)
+
+GIT
+  remote: https://github.com/rspec/rspec-rails
+  revision: 9c6d8f3eaa8049f940691b9489e7a7862cd912b0
+  branch: 4-0-dev
+  specs:
+    rspec-rails (4.0.0.beta2)
+      actionpack (>= 4.2)
+      activesupport (>= 4.2)
+      railties (>= 4.2)
+      rspec-core (~> 3.8)
+      rspec-expectations (~> 3.8)
+      rspec-mocks (~> 3.8)
+      rspec-support (~> 3.8)
+
+GIT
+  remote: https://github.com/rspec/rspec-support
+  revision: c69a231d7369dd165ad7ce4742e1a2e21e3462b5
+  specs:
+    rspec-support (3.9.0.pre)
+
 GEM
   remote: https://rubygems.org/
   specs:
@@ -209,23 +252,6 @@ GEM
     responders (3.0.0)
       actionpack (>= 5.0)
       railties (>= 5.0)
-    rspec-core (3.8.2)
-      rspec-support (~> 3.8.0)
-    rspec-expectations (3.8.4)
-      diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.8.0)
-    rspec-mocks (3.8.1)
-      diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.8.0)
-    rspec-rails (3.8.2)
-      actionpack (>= 3.0)
-      activesupport (>= 3.0)
-      railties (>= 3.0)
-      rspec-core (~> 3.8.0)
-      rspec-expectations (~> 3.8.0)
-      rspec-mocks (~> 3.8.0)
-      rspec-support (~> 3.8.0)
-    rspec-support (3.8.2)
     ruby_dep (1.5.0)
     rubyzip (1.2.3)
     sass (3.7.4)
@@ -309,7 +335,11 @@ DEPENDENCIES
   listen (>= 3.0.5, < 3.2)
   puma (~> 3.11)
   rails (~> 6.0.0.rc2)
-  rspec-rails
+  rspec-core!
+  rspec-expectations!
+  rspec-mocks!
+  rspec-rails!
+  rspec-support!
   sass-rails (~> 5.0)
   selenium-webdriver
   spring