Bump rexml from 3.2.6 to 3.2.7

Bumps [rexml](https://github.com/ruby/rexml) from 3.2.6 to 3.2.7.
- [Release notes](https://github.com/ruby/rexml/releases)
- [Changelog](https://github.com/ruby/rexml/blob/master/NEWS.md)
- [Commits](ruby/rexml@v3.2.6...v3.2.7)

---
updated-dependencies:
- dependency-name: rexml
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Gemfile.lock

@@ -386,7 +386,8 @@ GEM
     responders (3.1.0)
       actionpack (>= 5.2)
       railties (>= 5.2)
-    rexml (3.2.6)
+    rexml (3.2.7)
+      strscan (>= 3.0.9)
     rinku (2.0.6)
     rubocop (1.29.1)
       parallel (~> 1.10)
@@ -434,6 +435,7 @@ GEM
     stimulus-rails (0.7.2)
       rails (>= 6.0.0)
     stripe (8.0.0)
+    strscan (3.1.0)
     tarpon (0.4.0)
       http (~> 4.4)
     terminal-table (3.0.2)