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] <[email protected]>

Gemfile.lock

@@ -159,8 +159,7 @@ GEM
     regexp_parser (2.9.0)
     reline (0.4.2)
       io-console (~> 0.5)
-    rexml (3.3.6)
-      strscan
+    rexml (3.3.9)
     rubocop (1.60.2)
       json (~> 2.3)
       language_server-protocol (>= 3.17.0)
@@ -204,7 +203,6 @@ GEM
       net-ssh (>= 2.8.0)
     streamio-ffmpeg (3.0.2)
       multi_json (~> 1.8)
-    strscan (3.1.0)
     swagger-blocks (3.0.0)
     thor (1.3.0)
     timeout (0.4.1)