Build(deps-dev): bump rexml from 3.2.5 to 3.2.8 in /docs (#2424)

* Build(deps-dev): bump rexml from 3.2.5 to 3.2.8 in /docs

Bumps [rexml](https://github.com/ruby/rexml) from 3.2.5 to 3.2.8.
- [Release notes](https://github.com/ruby/rexml/releases)
- [Changelog](https://github.com/ruby/rexml/blob/master/NEWS.md)
- [Commits](https://github.com/ruby/rexml/compare/v3.2.5...v3.2.8)

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

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

* Bundle update

---------

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

Gemfile.lock

@@ -327,7 +327,8 @@ GEM
     responders (3.1.1)
       actionpack (>= 5.2)
       railties (>= 5.2)
-    rexml (3.2.6)
+    rexml (3.2.8)
+      strscan (>= 3.0.9)
     roo (2.10.1)
       nokogiri (~> 1)
       rubyzip (>= 1.3.0, < 3.0.0)
@@ -408,6 +409,7 @@ GEM
     smart_properties (1.17.0)
     stimulus-rails (1.3.3)
       railties (>= 6.0.0)
+    strscan (3.1.0)
     thor (1.3.0)
     timecop (0.9.8)
     timeout (0.4.1)

docs/Gemfile.lock

@@ -226,7 +226,8 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rexml (3.2.5)
+    rexml (3.2.8)
+      strscan (>= 3.0.9)
     rouge (3.26.0)
     ruby2_keywords (0.0.5)
     rubyzip (2.3.2)
@@ -241,6 +242,7 @@ GEM
       faraday (>= 0.17.3, < 3)
     simpleidn (0.2.1)
       unf (~> 0.1.4)
+    strscan (3.1.0)
     terminal-table (1.8.0)
       unicode-display_width (~> 1.1, >= 1.1.1)
     typhoeus (1.4.0)