AUTO: Update vulnerable gems to the latest version

bundle-audit output:
--------------------
Updating ruby-advisory-db ...
Updated ruby-advisory-db
ruby-advisory-db: 304 advisories
Name: loofah
Version: 2.1.1
Advisory: CVE-2018-8048
Criticality: Unknown
URL: flavorjones/loofah#144
Title: Loofah XSS Vulnerability
Solution: upgrade to >= 2.2.1

Name: nokogiri
Version: 1.8.1
Advisory: CVE-2017-15412
Criticality: Unknown
URL: sparklemotion/nokogiri#1714
Title: Nokogiri gem, via libxml, is affected by DoS vulnerabilities
Solution: upgrade to >= 1.8.2

Name: rails-html-sanitizer
Version: 1.0.3
Advisory: CVE-2018-3741
Criticality: Unknown
URL: https://groups.google.com/d/msg/rubyonrails-security/tP7W3kLc5u4/uDy2Br7xBgAJ
Title: XSS vulnerability in rails-html-sanitizer
Solution: upgrade to >= 1.0.4

Vulnerabilities found!

Gemfile.lock

@@ -663,7 +663,7 @@ GEM
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
       ruby_dep (~> 1.2)
-    loofah (2.1.1)
+    loofah (2.2.2)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     lumberjack (1.0.12)
@@ -679,7 +679,7 @@ GEM
     minitest (5.11.3)
     nenv (0.3.0)
     nio4r (2.2.0)
-    nokogiri (1.8.1)
+    nokogiri (1.8.2)
       mini_portile2 (~> 2.3.0)
     notiffany (0.1.1)
       nenv (~> 0.1)
@@ -713,8 +713,8 @@ GEM
     rails-dom-testing (2.0.3)
       activesupport (>= 4.2.0)
       nokogiri (>= 1.6)
-    rails-html-sanitizer (1.0.3)
-      loofah (~> 2.0)
+    rails-html-sanitizer (1.0.4)
+      loofah (~> 2.2, >= 2.2.2)
     rainbow (3.0.0)
     rake (12.3.0)
     rb-fsevent (0.10.2)