Bump rexml from 3.2.6 to 3.2.8 in the bundler group

Bumps the bundler group with 1 update: [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](ruby/rexml@v3.2.6...v3.2.8)

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

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

Gemfile.lock

@@ -101,7 +101,8 @@ GEM
     regexp_parser (2.9.0)
     reline (0.5.0)
       io-console (~> 0.5)
-    rexml (3.2.6)
+    rexml (3.2.8)
+      strscan (>= 3.0.9)
     rspec (3.13.0)
       rspec-core (~> 3.13.0)
       rspec-expectations (~> 3.13.0)
@@ -166,6 +167,7 @@ GEM
       syntax_tree (>= 6.1.1)
       thor (>= 0.19.2)
     stringio (3.1.0)
+    strscan (3.1.0)
     syntax_tree (6.2.0)
       prettier_print (>= 1.2.0)
     tapioca (0.12.0)