Build(deps): Bump rexml from 3.2.6 to 3.2.8 (#27055)

Bumps [rexml](https://github.com/ruby/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
...

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

Gemfile.lock

@@ -366,7 +366,8 @@ GEM
     regexp_parser (2.9.2)
     request_store (1.7.0)
       rack (>= 1.4)
-    rexml (3.2.6)
+    rexml (3.2.8)
+      strscan (>= 3.0.9)
     rinku (2.0.6)
     rotp (6.3.0)
     rouge (4.2.1)
@@ -497,6 +498,7 @@ GEM
     sqlite3 (1.7.3-x86_64-linux)
     sshkey (3.0.0)
     stackprof (0.2.26)
+    strscan (3.1.0)
     syntax_tree (6.2.0)
       prettier_print (>= 1.2.0)
     syntax_tree-disable_ternary (1.0.0)