Bump loofah from 2.0.3 to 2.6.0 in /api

Bumps [loofah](https://github.com/flavorjones/loofah) from 2.0.3 to 2.6.0.
- [Release notes](https://github.com/flavorjones/loofah/releases)
- [Changelog](https://github.com/flavorjones/loofah/blob/master/CHANGELOG.md)
- [Commits](flavorjones/loofah@v2.0.3...v2.6.0)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

api/Gemfile.lock

@@ -48,6 +48,7 @@ GEM
     byebug (9.0.6)
     coderay (1.1.1)
     concurrent-ruby (1.0.5)
+    crass (1.0.6)
     database_cleaner (1.5.3)
     delayed_job (4.1.8)
       activesupport (>= 3.0, < 6.1)
@@ -83,7 +84,8 @@ GEM
     hashie (3.5.5)
     i18n (0.8.6)
     json (2.0.4)
-    loofah (2.0.3)
+    loofah (2.6.0)
+      crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     mail (2.6.4)
       mime-types (>= 1.16, < 4)