Bump html-proofer from 3.18.3 to 3.18.5 (#257)

Bumps [html-proofer](https://github.com/gjtorikian/html-proofer) from 3.18.3 to 3.18.5.
- [Release notes](https://github.com/gjtorikian/html-proofer/releases)
- [Commits](gjtorikian/html-proofer@v3.18.3...v3.18.5)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Gemfile.lock

@@ -13,7 +13,7 @@ GEM
     eventmachine (1.2.7)
     ffi (1.14.2)
     forwardable-extended (2.6.0)
-    html-proofer (3.18.3)
+    html-proofer (3.18.5)
       addressable (~> 2.3)
       mercenary (~> 0.3)
       nokogumbo (~> 2.0)
@@ -61,8 +61,8 @@ GEM
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     mercenary (0.4.0)
-    mini_portile2 (2.4.0)
-    nokogiri (1.11.0)
+    mini_portile2 (2.5.0)
+    nokogiri (1.11.1)
       mini_portile2 (~> 2.5.0)
       racc (~> 1.4)
     nokogumbo (2.0.4)