Bump rexml from 3.2.8 to 3.2.9 (#139)

Bumps [rexml](https://github.com/ruby/rexml) from 3.2.8 to 3.2.9.
- [Release notes](https://github.com/ruby/rexml/releases)
- [Changelog](https://github.com/ruby/rexml/blob/master/NEWS.md)
- [Commits](ruby/rexml@v3.2.8...v3.2.9)

---
updated-dependencies:
- dependency-name: rexml
  dependency-type: indirect
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile.lock

@@ -38,8 +38,8 @@ GEM
       rake (~> 13.0)
     public_suffix (5.0.5)
     rake (13.2.1)
-    rexml (3.2.8)
-      strscan (>= 3.0.9)
+    rexml (3.2.9)
+      strscan
     rspec (3.13.0)
       rspec-core (~> 3.13.0)
       rspec-expectations (~> 3.13.0)