[Security] Bump loofah from 2.2.2 to 2.8.0

Bumps [loofah](https://github.com/flavorjones/loofah) from 2.2.2 to 2.8.0. **This update includes security fixes.**
- [Release notes](https://github.com/flavorjones/loofah/releases)
- [Changelog](https://github.com/flavorjones/loofah/blob/master/CHANGELOG.md)
- [Commits](flavorjones/loofah@v2.2.2...v2.8.0)

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

Gemfile.lock

@@ -56,7 +56,7 @@ GEM
       i18n_data (~> 0.8.0)
       sixarm_ruby_unaccent (~> 1.1)
       unicode_utils (~> 1.4)
-    crass (1.0.4)
+    crass (1.0.6)
     database_cleaner (1.7.0)
     diff-lcs (1.3)
     domain_name (0.5.20190701)
@@ -78,7 +78,7 @@ GEM
       concurrent-ruby (~> 1.0)
     i18n_data (0.8.0)
     konduto-ruby (2.1.0)
-    loofah (2.2.2)
+    loofah (2.8.0)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     mail (2.7.1)
@@ -88,13 +88,13 @@ GEM
       mime-types-data (~> 3.2015)
     mime-types-data (3.2019.1009)
     mini_mime (1.0.2)
-    mini_portile2 (2.3.0)
+    mini_portile2 (2.4.0)
     minitest (5.11.3)
     multi_json (1.14.1)
     multipart-post (2.1.1)
     netrc (0.11.0)
-    nokogiri (1.8.4)
-      mini_portile2 (~> 2.3.0)
+    nokogiri (1.10.10)
+      mini_portile2 (~> 2.4.0)
     pagarme (2.1.4)
       multi_json
       rest-client