Bump rexml from 3.3.6 to 3.3.9 in the bundler group across 1 directory (#1010)

Bumps the bundler group with 1 update in the / directory: [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] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Kate Lynch <[email protected]>

Author: dependabot[bot]

Gemfile.lock

@@ -374,8 +374,7 @@ GEM
     responders (3.1.1)
       actionpack (>= 5.2)
       railties (>= 5.2)
-    rexml (3.3.6)
-      strscan
+    rexml (3.3.9)
     rspec-core (3.13.0)
       rspec-support (~> 3.13.0)
     rspec-expectations (3.13.0)
@@ -470,7 +469,6 @@ GEM
       net-ssh (>= 2.8.0)
     stimulus-rails (1.3.3)
       railties (>= 6.0.0)
-    strscan (3.1.0)
     sync (0.5.0)
     term-ansicolor (1.8.0)
       tins (~> 1.0)