Bump rexml from 3.3.8 to 3.3.9 (#1255)

Bumps [rexml](https://github.com/ruby/rexml) from 3.3.8 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@v3.3.8...v3.3.9)

---
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

@@ -228,7 +228,7 @@ GEM
     regexp_parser (2.9.2)
     reline (0.5.10)
       io-console (~> 0.5)
-    rexml (3.3.8)
+    rexml (3.3.9)
     rspec-core (3.13.2)
       rspec-support (~> 3.13.0)
     rspec-expectations (3.13.3)
@@ -454,7 +454,7 @@ CHECKSUMS
   rdoc (6.7.0) sha256=b17d5f0f57b0853d7b880d4360a32c7caf8dbb81f8503a36426df809e617f379
   regexp_parser (2.9.2) sha256=5a27e767ad634f8a4b544520d5cd28a0db7aa1198a5d7c9d7e11d7b3d9066446
   reline (0.5.10) sha256=1660c969a792ebd034e6ceee8ca628f3b6698dcdb34f7a282a5edda37b958166
-  rexml (3.3.8) sha256=f68fd96345330a1062896d0d0401324b0dae0ee20f784791b0843db96b212167
+  rexml (3.3.9) sha256=d71875b85299f341edf47d44df0212e7658cbdf35aeb69cefdb63f57af3137c9
   rspec-core (3.13.2) sha256=94fbda6e4738e478f1c7532b7cc241272fcdc8b9eac03a97338b1122e4573300
   rspec-expectations (3.13.3) sha256=0e6b5af59b900147698ea0ff80456c4f2e69cac4394fbd392fbd1ca561f66c58
   rspec-mocks (3.13.2) sha256=2327335def0e1665325a9b617e3af9ae20272741d80ac550336309a7c59abdef