Bump rexml from 3.2.5 to 3.3.6

Bumps [rexml](https://github.com/ruby/rexml) from 3.2.5 to 3.3.6.
- [Release notes](https://github.com/ruby/rexml/releases)
- [Changelog](https://github.com/ruby/rexml/blob/master/NEWS.md)
- [Commits](ruby/rexml@v3.2.5...v3.3.6)

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

Signed-off-by: dependabot[bot] <support@github.com>

Gemfile.lock

@@ -131,7 +131,8 @@ GEM
     redis-client (0.14.1)
       connection_pool
     regexp_parser (2.8.0)
-    rexml (3.2.5)
+    rexml (3.3.6)
+      strscan
     rubocop (1.50.2)
       json (~> 2.3)
       parallel (~> 1.10)
@@ -169,6 +170,7 @@ GEM
     standard-performance (1.0.1)
       lint_roller (~> 1.0)
       rubocop-performance (~> 1.16.0)
+    strscan (3.1.0)
     unicode-display_width (2.4.2)
     yard (0.9.36)