Bump rexml from 3.3.6 to 3.3.9 (#486)

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

Gemfile.lock

@@ -4,8 +4,7 @@ GEM
     bashcov (3.0.2)
       simplecov (~> 0.21.2)
     docile (1.4.0)
-    rexml (3.3.6)
-      strscan
+    rexml (3.3.9)
     simplecov (0.21.2)
       docile (~> 1.1)
       simplecov-html (~> 0.11)
@@ -15,7 +14,6 @@ GEM
       simplecov (~> 0.19)
     simplecov-html (0.12.3)
     simplecov_json_formatter (0.1.4)
-    strscan (3.1.0)
 
 PLATFORMS
   x86_64-darwin-22