Bump rexml from 3.3.3 to 3.3.6 (#717)

Bumps [rexml](https://github.com/ruby/rexml) from 3.3.3 to 3.3.6.

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Gemfile.lock

@@ -174,7 +174,7 @@ GEM
     redis-client (0.14.0)
       connection_pool
     regexp_parser (2.7.0)
-    rexml (3.3.3)
+    rexml (3.3.6)
       strscan
     rubocop (1.44.1)
       json (~> 2.3)