Bump loofah from 2.3.0 to 2.3.1 in /spec/dummy (#16)

Bumps [loofah](https://github.com/flavorjones/loofah) from 2.3.0 to 2.3.1.
- [Release notes](https://github.com/flavorjones/loofah/releases)
- [Changelog](https://github.com/flavorjones/loofah/blob/master/CHANGELOG.md)
- [Commits](flavorjones/loofah@v2.3.0...v2.3.1)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

spec/dummy/Gemfile.lock

@@ -73,7 +73,7 @@ GEM
     byebug (10.0.2)
     coderay (1.1.2)
     concurrent-ruby (1.1.5)
-    crass (1.0.4)
+    crass (1.0.5)
     datetime_picker_rails (0.0.7)
       momentjs-rails (>= 2.8.1)
     diff-lcs (1.3)
@@ -102,7 +102,7 @@ GEM
       activerecord
       kaminari-core (= 1.1.1)
     kaminari-core (1.1.1)
-    loofah (2.3.0)
+    loofah (2.3.1)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     mail (2.7.1)
@@ -117,7 +117,7 @@ GEM
     momentjs-rails (2.20.1)
       railties (>= 3.1)
     nio4r (2.4.0)
-    nokogiri (1.10.4)
+    nokogiri (1.10.5)
       mini_portile2 (~> 2.4.0)
     pry (0.12.2)
       coderay (~> 1.1.0)