Merge branch '21748-updating-omniauth-facebook' into 'master'

Update omniauth-facebook to '~>4.0.0'

## What does this MR do?
Update omniauth-facebook to '~>4.0.0'

## What are the relevant issue numbers?

Closes #21748 

cc @ubudzisz @yorickpeterse @grzesiek @tmaczukin

See merge request !6321

Gemfile

@@ -26,7 +26,7 @@ gem 'omniauth-auth0',         '~> 1.4.1'
 gem 'omniauth-azure-oauth2',  '~> 0.0.6'
 gem 'omniauth-bitbucket',     '~> 0.0.2'
 gem 'omniauth-cas3',          '~> 1.1.2'
-gem 'omniauth-facebook',      '~> 3.0.0'
+gem 'omniauth-facebook',      '~> 4.0.0'
 gem 'omniauth-github',        '~> 1.1.1'
 gem 'omniauth-gitlab',        '~> 1.0.0'
 gem 'omniauth-google-oauth2', '~> 0.4.1'

Gemfile.lock

@@ -333,7 +333,7 @@ GEM
       temple (~> 0.7.6)
       thor
       tilt
-    hashie (3.4.3)
+    hashie (3.4.4)
     health_check (2.1.0)
       rails (>= 4.0)
     hipchat (1.5.2)
@@ -444,7 +444,7 @@ GEM
       addressable (~> 2.3)
       nokogiri (~> 1.6.6)
       omniauth (~> 1.2)
-    omniauth-facebook (3.0.0)
+    omniauth-facebook (4.0.0)
       omniauth-oauth2 (~> 1.2)
     omniauth-github (1.1.2)
       omniauth (~> 1.0)
@@ -909,7 +909,7 @@ DEPENDENCIES
   omniauth-azure-oauth2 (~> 0.0.6)
   omniauth-bitbucket (~> 0.0.2)
   omniauth-cas3 (~> 1.1.2)
-  omniauth-facebook (~> 3.0.0)
+  omniauth-facebook (~> 4.0.0)
   omniauth-github (~> 1.1.1)
   omniauth-gitlab (~> 1.0.0)
   omniauth-google-oauth2 (~> 0.4.1)