Bump rexml from 3.3.6 to 3.3.9 in the bundler group

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


Updates `rexml` from 3.3.6 to 3.3.9
- [Release notes](https://github.com/ruby/rexml/releases)
- [Changelog](https://github.com/ruby/rexml/blob/master/NEWS.md)
- [Commits](ruby/rexml@v3.3.6...v3.3.9)

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

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

Gemfile.lock

@@ -84,8 +84,7 @@ GEM
       multi_json (~> 1.0)
       redis-namespace (~> 1.6)
       sinatra (>= 0.9.2)
-    rexml (3.3.6)
-      strscan
+    rexml (3.3.9)
     rubocop (1.64.1)
       json (~> 2.3)
       language_server-protocol (>= 3.17.0)
@@ -115,7 +114,6 @@ GEM
       rack-session (>= 2.0.0, < 3)
       tilt (~> 2.0)
     sorbet-runtime (0.5.11460)
-    strscan (3.1.0)
     tilt (2.4.0)
     timeout (0.4.1)
     tzinfo (2.0.6)