build(deps): bump rexml from 3.2.6 to 3.2.7

Bumps [rexml](https://github.com/ruby/rexml) from 3.2.6 to 3.2.7.
- [Release notes](https://github.com/ruby/rexml/releases)
- [Changelog](https://github.com/ruby/rexml/blob/master/NEWS.md)
- [Commits](ruby/rexml@v3.2.6...v3.2.7)

---
updated-dependencies:
- dependency-name: rexml
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile.lock

@@ -528,7 +528,8 @@ GEM
       railties (>= 5.2)
     reverse_markdown (2.1.1)
       nokogiri
-    rexml (3.2.6)
+    rexml (3.2.7)
+      strscan (>= 3.0.9)
     rotp (6.3.0)
     rouge (4.2.0)
     rqrcode (2.2.0)
@@ -656,6 +657,7 @@ GEM
     stringio (3.1.0)
     strong_migrations (1.7.0)
       activerecord (>= 5.2)
+    strscan (3.1.0)
     temping (4.1.1)
       activerecord (>= 6.0, < 7.2)
       activesupport (>= 6.0, < 7.2)