Bump rexml from 3.2.5 to 3.2.8 (#555)

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
...

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

Gemfile.lock

@@ -433,7 +433,8 @@ GEM
     responders (3.0.1)
       actionpack (>= 5.0)
       railties (>= 5.0)
-    rexml (3.2.6)
+    rexml (3.2.8)
+      strscan (>= 3.0.9)
     rgeo (2.3.1)
     rgeo-activerecord (7.0.1)
       activerecord (>= 5.0)
@@ -573,7 +574,7 @@ GEM
     standard-rails (1.0.2)
       lint_roller (~> 1.0)
       rubocop-rails (~> 2.23.1)
-    strscan (3.0.1)
+    strscan (3.1.0)
     temple (0.8.2)
     terminal-table (3.0.2)
       unicode-display_width (>= 1.1.1, < 3)