Update dependency rexml to v3.2.7 [SECURITY]

Author: renovate[bot]

Gemfile.lock

@@ -238,7 +238,8 @@ GEM
     responders (3.0.1)
       actionpack (>= 5.0)
       railties (>= 5.0)
-    rexml (3.2.5)
+    rexml (3.2.8)
+      strscan (>= 3.0.9)
     rspec-core (3.13.0)
       rspec-support (~> 3.13.0)
     rspec-expectations (3.13.0)
@@ -287,6 +288,7 @@ GEM
       actionpack (>= 5.2)
       activesupport (>= 5.2)
       sprockets (>= 3.0.0)
+    strscan (3.1.0)
     tailwindcss-rails (2.0.8-x86_64-linux)
       railties (>= 6.0.0)
     terser (1.1.14)