Bump browser gem to v2.5.3

Full list of changes: https://github.com/fnando/browser/blob/master/CHANGELOG.md

Gemfile

@@ -68,7 +68,7 @@ gem 'u2f', '~> 0.2.1'
 gem 'validates_hostname', '~> 1.0.6'
 
 # Browser detection
-gem 'browser', '~> 2.2'
+gem 'browser', '~> 2.5'
 
 # GPG
 gem 'gpgme'

Gemfile.lock

@@ -90,7 +90,7 @@ GEM
       msgpack (~> 1.0)
     bootstrap_form (2.7.0)
     brakeman (4.2.1)
-    browser (2.2.0)
+    browser (2.5.3)
     builder (3.2.3)
     bullet (5.5.1)
       activesupport (>= 3.0.0)
@@ -991,7 +991,7 @@ DEPENDENCIES
   bootsnap (~> 1.3)
   bootstrap_form (~> 2.7.0)
   brakeman (~> 4.2)
-  browser (~> 2.2)
+  browser (~> 2.5)
   bullet (~> 5.5.0)
   bundler-audit (~> 0.5.0)
   capybara (~> 2.15)

Gemfile.rails5.lock

@@ -93,7 +93,7 @@ GEM
       msgpack (~> 1.0)
     bootstrap_form (2.7.0)
     brakeman (4.2.1)
-    browser (2.2.0)
+    browser (2.5.3)
     builder (3.2.3)
     bullet (5.5.1)
       activesupport (>= 3.0.0)
@@ -1000,7 +1000,7 @@ DEPENDENCIES
   bootsnap (~> 1.3)
   bootstrap_form (~> 2.7.0)
   brakeman (~> 4.2)
-  browser (~> 2.2)
+  browser (~> 2.5)
   bullet (~> 5.5.0)
   bundler-audit (~> 0.5.0)
   capybara (~> 2.15)