Bump loofah from 2.4.0 to 2.19.1

Bumps [loofah](https://github.com/flavorjones/loofah) from 2.4.0 to 2.19.1.
- [Release notes](https://github.com/flavorjones/loofah/releases)
- [Changelog](https://github.com/flavorjones/loofah/blob/main/CHANGELOG.md)
- [Commits](flavorjones/loofah@v2.4.0...v2.19.1)

---
updated-dependencies:
- dependency-name: loofah
  dependency-type: indirect
...

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

Gemfile.lock

@@ -41,14 +41,14 @@ GEM
     erubi (1.9.0)
     i18n (1.8.2)
       concurrent-ruby (~> 1.0)
-    loofah (2.4.0)
+    loofah (2.19.1)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     meta-tags (2.13.0)
       actionpack (>= 3.2.0, < 6.1)
     mini_portile2 (2.4.0)
     minitest (5.14.0)
-    nokogiri (1.10.9)
+    nokogiri (1.10.10)
       mini_portile2 (~> 2.4.0)
     rack (2.2.2)
     rack-test (1.1.0)