Bump rexml from 3.2.6 to 3.2.8 (#1537)

Bumps [rexml](https://github.com/ruby/rexml) from 3.2.6 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@v3.2.6...v3.2.8)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: PaulDoyle-DEFRA <97455399+PaulDoyle-DEFRA@users.noreply.github.com>

Gemfile.lock

@@ -347,7 +347,8 @@ GEM
       http-cookie (>= 1.0.2, < 2.0)
       mime-types (>= 1.16, < 4.0)
       netrc (~> 0.8)
-    rexml (3.2.6)
+    rexml (3.2.8)
+      strscan (>= 3.0.9)
     rspec (3.12.0)
       rspec-core (~> 3.12.0)
       rspec-expectations (~> 3.12.0)
@@ -428,6 +429,7 @@ GEM
     stateoscope (0.1.3)
       activesupport
       ruby-graphviz
+    strscan (3.1.0)
     thor (1.3.1)
     tilt (2.3.0)
     timecop (0.9.8)