Bump rexml from 3.3.6 to 3.3.9

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

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

Gemfile.lock

@@ -29,8 +29,7 @@ GEM
       parser (~> 3.2.0)
       rainbow (>= 2.0, < 4.0)
     regexp_parser (2.8.2)
-    rexml (3.3.6)
-      strscan
+    rexml (3.3.9)
     rubocop (1.57.2)
       json (~> 2.3)
       language_server-protocol (>= 3.17.0)
@@ -45,7 +44,6 @@ GEM
     rubocop-ast (1.30.0)
       parser (>= 3.2.1.0)
     ruby-progressbar (1.13.0)
-    strscan (3.1.0)
     unicode-display_width (2.5.0)
 
 PLATFORMS