Merge pull request #1583 from github/dependabot/bundler/html-proofer-3.15.3

Bump html-proofer from 3.15.2 to 3.15.3

Author: mlinksva

Gemfile.lock

@@ -83,7 +83,7 @@ GEM
     html-pipeline (2.12.3)
       activesupport (>= 2)
       nokogiri (>= 1.4)
-    html-proofer (3.15.2)
+    html-proofer (3.15.3)
       addressable (~> 2.3)
       mercenary (~> 0.3)
       nokogumbo (~> 2.0)