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](ruby/rexml@v3.2.5...v3.2.8)

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

Signed-off-by: dependabot[bot] <[email protected]>

docs/Gemfile.lock

@@ -31,7 +31,6 @@ GEM
     faraday-net_http (3.1.0)
       net-http
     ffi (1.16.3)
-    ffi (1.16.3-x64-mingw32)
     forwardable-extended (2.6.0)
     gemoji (4.1.0)
     github-pages (231)
@@ -208,16 +207,14 @@ GEM
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     mercenary (0.3.6)
-    mini_portile2 (2.8.5)
     minima (2.5.1)
       jekyll (>= 3.5, < 5.0)
       jekyll-feed (~> 0.9)
       jekyll-seo-tag (~> 2.1)
     minitest (5.22.2)
     net-http (0.4.1)
       uri
-    nokogiri (1.16.2)
-      mini_portile2 (~> 2.8.2)
+    nokogiri (1.16.2-x64-mingw-ucrt)
       racc (~> 1.4)
     nokogiri (1.16.2-x64-mingw32)
       racc (~> 1.4)
@@ -233,7 +230,8 @@ 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 (3.30.0)
     rubyzip (2.3.2)
     safe_yaml (1.0.5)
@@ -247,6 +245,7 @@ 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)
     thread_safe (0.3.6)
@@ -259,7 +258,6 @@ GEM
     unf (0.1.4)
       unf_ext
     unf_ext (0.0.9.1)
-    unf_ext (0.0.9.1-x64-mingw32)
     unicode-display_width (1.8.0)
     uri (0.13.0)
     wdm (0.1.1)