Bump rexml from 3.2.6 to 3.2.8 in /frameworks/Ruby/rack

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
...

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

frameworks/Ruby/rack/Gemfile.lock

@@ -87,7 +87,8 @@ GEM
     rainbow (3.1.1)
     raindrops (0.20.1)
     regexp_parser (2.9.1)
-    rexml (3.2.6)
+    rexml (3.2.8)
+      strscan (>= 3.0.9)
     rubocop (1.63.5)
       json (~> 2.3)
       language_server-protocol (>= 3.17.0)
@@ -110,6 +111,7 @@ GEM
     sequel_pg (1.17.1)
       pg (>= 0.18.0, != 1.2.0)
       sequel (>= 4.38.0)
+    strscan (3.1.0)
     timers (4.3.5)
     traces (0.11.1)
     tzinfo (2.0.6)