Merge pull request #4254 from vespa-engine/renovate/html-proofer-5.x-lockfile

Update dependency html-proofer to v5.1.1

Author: kkraune

Gemfile.lock

@@ -25,6 +25,7 @@ GEM
       metrics (~> 0.12)
       traces (~> 0.18)
     base64 (0.3.0)
+    benchmark (0.5.0)
     bigdecimal (3.3.1)
     coffee-script (2.4.1)
       coffee-script-source
@@ -120,9 +121,10 @@ GEM
     html-pipeline (2.14.3)
       activesupport (>= 2)
       nokogiri (>= 1.4)
-    html-proofer (5.1.0)
+    html-proofer (5.1.1)
       addressable (~> 2.3)
       async (~> 2.1)
+      benchmark (~> 0.5)
       nokogiri (~> 1.13)
       pdf-reader (~> 2.11)
       rainbow (~> 3.0)
@@ -132,7 +134,7 @@ GEM
     http_parser.rb (0.8.0)
     i18n (1.14.7)
       concurrent-ruby (~> 1.0)
-    io-event (1.14.0)
+    io-event (1.14.2)
     jekyll (3.10.0)
       addressable (~> 2.4)
       colorator (~> 1.0)