Bump rexml from 3.2.6 to 3.2.8

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>

Gemfile.lock

@@ -265,7 +265,8 @@ GEM
       io-console (~> 0.5)
     request_store (1.6.0)
       rack (>= 1.4)
-    rexml (3.2.6)
+    rexml (3.2.8)
+      strscan (>= 3.0.9)
     rollbar (3.5.2)
     rspec-core (3.13.0)
       rspec-support (~> 3.13.0)
@@ -310,6 +311,7 @@ GEM
       railties (>= 6.0.0)
     stringio (3.1.0)
     stripe (11.4.0)
+    strscan (3.1.0)
     tailwindcss-rails (2.6.0-aarch64-linux)
       railties (>= 7.0.0)
     tailwindcss-rails (2.6.0-arm64-darwin)