AO3-5789 Update Database Cleaner and test-only gems (#3652)

* Upgrade database_cleaner to remove deprecations

One step closer to Rails 5.2:

`DEPRECATION WARNING: schema_migrations_table_name is deprecated and will be removed from Rails 5.2`

Our previous version of `database_cleaner` used `schema_migrations_table_name`.

This commit upgrades it to the minimum viable version that gets rid of the deprecated code, since newer versions may require more work to be compatible with our current test suite.

* Update test-only gems that are not locked

Gemfile

@@ -141,7 +141,7 @@ group :test do
   gem 'pickle'
   gem 'shoulda'
   gem 'capybara', '~> 2.16.1'
-  gem 'database_cleaner', '1.5.2'
+  gem 'database_cleaner', '1.6.0'
   gem 'cucumber', '~> 2.4.0'
   gem 'poltergeist'
   gem 'capybara-screenshot'

Gemfile.lock

@@ -92,7 +92,7 @@ GEM
     bcrypt (3.1.11)
     brakeman (3.7.2)
     builder (3.2.3)
-    bullet (5.9.0)
+    bullet (6.0.2)
       activesupport (>= 3.0.0)
       uniform_notifier (~> 1.11)
     bundler-audit (0.5.0)
@@ -117,15 +117,15 @@ GEM
       rack (>= 1.0.0)
       rack-test (>= 0.5.4)
       xpath (~> 2.0)
-    capybara-screenshot (1.0.14)
-      capybara (>= 1.0, < 3)
+    capybara-screenshot (1.0.23)
+      capybara (>= 1.0, < 4)
       launchy
     chronic (0.10.2)
     climate_control (0.2.0)
     cliver (0.3.2)
     cocaine (0.5.8)
       climate_control (>= 0.0.3, < 1.0)
-    codecov (0.1.10)
+    codecov (0.1.14)
       json
       simplecov
       url
@@ -159,7 +159,7 @@ GEM
       timecop
     cucumber-wire (0.0.1)
     dalli (2.7.6)
-    database_cleaner (1.5.2)
+    database_cleaner (1.6.0)
     delorean (2.1.0)
       chronic
     devise (4.7.1)
@@ -282,8 +282,8 @@ GEM
     pickle (0.5.5)
       cucumber (>= 0.8, < 4.0)
       rake
-    poltergeist (1.15.0)
-      capybara (~> 2.1)
+    poltergeist (1.18.1)
+      capybara (>= 2.1, < 4)
       cliver (~> 0.3.1)
       websocket-driver (>= 0.2.0)
     power_assert (1.0.2)
@@ -370,7 +370,7 @@ GEM
     rspec-mocks (3.6.0)
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.6.0)
-    rspec-rails (3.6.0)
+    rspec-rails (3.6.1)
       actionpack (>= 3.0)
       activesupport (>= 3.0)
       railties (>= 3.0)
@@ -388,17 +388,17 @@ GEM
       crass (~> 1.0.2)
       nokogiri (>= 1.4.4)
       nokogumbo (~> 1.4)
-    shoulda (3.5.0)
+    shoulda (3.6.0)
       shoulda-context (~> 1.0, >= 1.0.1)
-      shoulda-matchers (>= 1.4.1, < 3.0)
+      shoulda-matchers (~> 3.0)
     shoulda-context (1.2.2)
-    shoulda-matchers (2.8.0)
-      activesupport (>= 3.0.0)
+    shoulda-matchers (3.1.3)
+      activesupport (>= 4.0.0)
     simplecov (0.14.1)
       docile (~> 1.1.0)
       json (>= 1.8, < 3)
       simplecov-html (~> 0.10.0)
-    simplecov-html (0.10.1)
+    simplecov-html (0.10.2)
     sinatra (2.0.3)
       mustermann (~> 1.0)
       rack (~> 2.0)
@@ -418,7 +418,7 @@ GEM
     thor (0.20.3)
     thread_safe (0.3.6)
     tilt (2.0.8)
-    timecop (0.8.1)
+    timecop (0.9.1)
     timeliness (0.3.8)
     transaction_isolation (1.0.5)
       activerecord (>= 3.0.11)
@@ -490,7 +490,7 @@ DEPENDENCIES
   cucumber-rails (~> 1.5)
   cucumber-timecop
   dalli
-  database_cleaner (= 1.5.2)
+  database_cleaner (= 1.6.0)
   delorean
   devise
   devise-async