chore(deps-dev): bump rexml from 3.2.5 to 3.2.8 (#1537)

Bumps [rexml](https://github.com/ruby/rexml) from 3.2.5 to 3.2.8.
- [Release notes](https://github.com/ruby/rexml/releases)
- [Changelog](https://github.com/ruby/rexml/blob/master/NEWS.md)
- [Commits](ruby/rexml@v3.2.5...v3.2.8)

---
updated-dependencies:
- dependency-name: rexml
  dependency-type: indirect
...

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

Gemfile.lock

@@ -332,7 +332,8 @@ GEM
     responders (3.1.0)
       actionpack (>= 5.2)
       railties (>= 5.2)
-    rexml (3.2.5)
+    rexml (3.2.8)
+      strscan (>= 3.0.9)
     rspec-core (3.10.1)
       rspec-support (~> 3.10.0)
     rspec-expectations (3.10.1)
@@ -408,6 +409,7 @@ GEM
       sprockets (>= 3.0.0)
     sqlite3 (1.5.4)
       mini_portile2 (~> 2.8.0)
+    strscan (3.1.0)
     temple (0.8.2)
     terrapin (0.6.0)
       climate_control (>= 0.0.3, < 1.0)