Bump rexml from 3.2.5 to 3.2.8

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] <support@github.com>

Author: dependabot[bot]

Gemfile.lock

@@ -41,7 +41,8 @@ GEM
     rainbow (3.1.1)
     rake (13.0.1)
     regexp_parser (2.6.0)
-    rexml (3.2.5)
+    rexml (3.2.8)
+      strscan (>= 3.0.9)
     rubocop (1.36.0)
       json (~> 2.3)
       parallel (~> 1.10)
@@ -60,6 +61,7 @@ GEM
     rubyntlm (0.6.3)
     spidey (0.1.0)
       mechanize
+    strscan (3.1.0)
     unf (0.1.4)
       unf_ext
     unf_ext (0.0.8.2)