Bump rexml from 3.3.4 to 3.3.9

Bumps [rexml](https://github.com/ruby/rexml) from 3.3.4 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@v3.3.4...v3.3.9)

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

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

Gemfile.lock

@@ -33,8 +33,7 @@ GEM
     rainbow (3.1.1)
     rake (13.2.1)
     regexp_parser (2.9.2)
-    rexml (3.3.4)
-      strscan
+    rexml (3.3.9)
     rubocop (1.64.1)
       json (~> 2.3)
       language_server-protocol (>= 3.17.0)
@@ -71,7 +70,6 @@ GEM
     standard-performance (1.4.0)
       lint_roller (~> 1.1)
       rubocop-performance (~> 1.21.0)
-    strscan (3.1.0)
     tilt (2.4.0)
     unicode-display_width (2.5.0)