build(deps): Bump rexml from 3.3.1 to 3.3.9

Bumps [rexml](https://github.com/ruby/rexml) from 3.3.1 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@v3.3.1...v3.3.9)

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

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

Gemfile.lock

@@ -327,8 +327,7 @@ GEM
     repost (0.3.8)
     request_store (1.7.0)
       rack (>= 1.4)
-    rexml (3.3.1)
-      strscan
+    rexml (3.3.9)
     rspec (3.13.0)
       rspec-core (~> 3.13.0)
       rspec-expectations (~> 3.13.0)
@@ -402,7 +401,6 @@ GEM
       activesupport (>= 6.1)
       sprockets (>= 3.0.0)
     stringio (3.1.1)
-    strscan (3.1.0)
     sync (0.5.0)
     syslog_protocol (0.9.2)
     term-ansicolor (1.10.2)