Bump rexml in /bindings/ruby in the bundler group across 1 directory (#236)

Bumps the bundler group with 1 update in the /bindings/ruby directory: [rexml](https://github.com/ruby/rexml).


Updates `rexml` from 3.2.6 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/v3.2.6...v3.2.8)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

bindings/ruby/Gemfile.lock

@@ -23,7 +23,8 @@ GEM
     rake-compiler-dock (1.4.0)
     rb_sys (0.9.91)
     regexp_parser (2.9.0)
-    rexml (3.2.6)
+    rexml (3.2.8)
+      strscan (>= 3.0.9)
     rubocop (1.63.0)
       json (~> 2.3)
       language_server-protocol (>= 3.17.0)
@@ -43,6 +44,7 @@ GEM
     rubocop-rake (0.6.0)
       rubocop (~> 1.0)
     ruby-progressbar (1.13.0)
+    strscan (3.1.0)
     unicode-display_width (2.5.0)
 
 PLATFORMS